单项选择题

This was the first time （）I had serious trouble with my boss.

A. since
B. that
C. with
D. when

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单项选择题
() tomorrow’s lessons, I have no time to go out with you.

A. Not preparing
B. Not to prepare
C. Not being prepared
D. Not having prepared
单项选择题
Michael doesn’t know what to () at the university; he can’t make up his mind about his future.

A. take up
B. take over
C. take in
D. take down
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