题目内容

We all know that some thing exist ( ) we cannot see them with our own eyes.

A. as soon as
B. even though
C. as far as
D. now that

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There may be a need for retraining if you expect employees ( ) the new technology.

A. using
B. use
C. to use
D. used

It was soon after the economic crisis ( ) sales of e-businesss started to grow.

A. why
B. how
C. where
D. that

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A. serviced
B. be servicing
C. to service
D. servicing

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A. being covered
B. covering
C. cover
D. covered