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1、[单选题]He came back late,________ which time all the guests had already left.
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A.after
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B.by
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C.at
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D.during
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2、[单选题]No sooner had we reached the top of the hill ________ we all sat down to rest.
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A.when
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B.then
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C.than
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D.until
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3、[单选题]Some metals are better conductors of electricity than others,_____ means that the former have atom that contain more free electron than the latter.
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A.that
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B.this
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C.which
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D.it
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4、[单选题]The basic features of the communication process are identified in one question: Who says ________ through what channel to whom?
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A.how
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B.when
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C.what
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D.such
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5、[单选题]________ you are familiar with the author’s ideas,try reading all the sections as quickly as you possibly can.
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A.As long as
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B.Ever since
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C.So that
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D.Now that
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6、[单选题]________,he does get annoyed with her sometimes.
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7、[单选题]I hope all the precautions against air pollution,________ suggested by the local government,will be seriously considered here.
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A.while
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B.since
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C.after
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D.as
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8、[单选题]These two areas are similar ________ they both have a high rainfall during this season.
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A.to that
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B.besides that
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C.in that
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D.except that
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9、[单选题]Evidence came up ________ specific speech sounds are recognized by babies as young as 6 months old.
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A.what
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B.which
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C.that
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D.whose
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10、[单选题]There is hardly an environment on earth ________ some species of animal or other has not adapted to an environment successfully.
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A.to which
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B.wherever
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C.so that
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D.as to
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11、[单选题]Living in the western part of the country has its problems,________ obtaining fresh water is not the least.
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A.with which
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B.for which
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C.of which
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D.which
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12、[单选题]I’ve never been to Beijing,but it’s the place ________.
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A.where I’d like to visit
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B.I most want to visit
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C.in which I’d like to visit
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D.that I want to visit it most
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13、[单选题]The time is not far away ________ modern communications will become widespread in China’s vast countryside.
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A.when
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B.as
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C.until
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D.before
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14、[单选题]There are signs ________ restaurants are becoming more popular with families.
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A.that
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B.which
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C.in which
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D.whose
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15、[单选题]________ we have finished the course,we shall start doing more revision work.
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A.For now
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B.Now that
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C.Ever since
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D.By now
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