单项选择题

--are you trying to prove to police
--Where I was last night.（）

A. What
B. Why
C. How
D. When

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单项选择题
As it turned out to be a problem of no importance, we（）so much time looking into it.

A. needn't spend
B. didn't have to spend
C. oughtn't to spend
D. needn't have spent
单项选择题
It is important that the committee（）about the project at once.

A. will be informed
B. is informed
C. being informed
D. be informed
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