[单选题] I have been studying puter for several years and I still _____.

1、[单选题]________ with the size of the whole earth, the biggest ocean doesn’t seem big at all.

• A、pare
• B、When paring
• C、paring
• D、When pared

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2、[单选题]________ such heavy pollution already, it may now be too late to clean up the river.

• A、Having suffered
• B、Suffering
• C、To suffer
• D、Suffered

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3、[单选题]You were silly not ________ your car.

• A、to lock
• B、to have locked
• C、locking
• D、having locked

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4、[单选题]The managers discussed the plan that they would like to see ________ the next year.

• A、carried out
• B、carrying out
• C、carry out
• D、to carry out

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5、[单选题]The flu is believed ________ by viruses that like to reproduce in the cells inside the human nose and throat.

• A、cause
• B、being caused
• C、to be caused
• D、to have caused

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