[单选题] The purpose of new technologies is to make life easier, _______ it more difficult.

1、[单选题]The old man, ________ abroad for twenty years, is on the way back to his motherland.

• A、to work
• B、working
• C、to have worked
• D、having worked

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2、[单选题]The disc, digitally ________ in the studio, sounded fantastic at the party that night.

• A、recorded
• B、recording
• C、to be recorded
• D、having recorded

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3、[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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4、[单选题]“We can’t go out in this weather,” said Bob, ________ out of the window.

• A、looking
• B、to look
• C、looked
• D、having looked

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5、[单选题]The research is so designed that once ________ nothing can be done to change it.

• A、begins
• B、having begun
• C、beginning
• D、begun

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