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

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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
单项选择题
--I enjoyed myself so much at your birthday party. -- （）

A. Oh, that's kind of you
B. Congratulations
C. Oh, I'm glad to hear that
D. It's a pleasure
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