题目内容

If I____his email address,I would have sent him a message yesterday.

A. have known
B. had known
C. will know
D. know

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The more satisfied your employees are, the more they will contribute____the success of your company.

A. on
B. about
C. with
D. to

He read my credit card number out loud in front of customers____I could stop him.

A. before
B. while
C. as
D. since

Jolm spent a lot of time____ to his colleagues how challenging the project was. A) explail1B) C) D)

A. explain
B. explaining
C. to explain
D. explained

It is the high efficiency of the new equipment____has increasingly attracted our attention.A) B) C) D)

A. which
B. what
C. that
D. who

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