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

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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
单项选择题
The doctor will not perform the operation ()it is absolutely necessary.

A. if
B. unless
C. when
D. as
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