单项选择题

You（）all those calculations! We have a computer to do that sort of thing.

A、 needn't have done
B、 must not have done
C、 shouldn't have done
D、 can not have done

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单项选择题
Our teacher recommends that we（）as attentive as possible when we visit the museum.

A、 are
B、 shall be
C、 were
D、 be
单项选择题
Bob' leg got hurt（）the Purple Mountains.

A、 while he is climbing up
B、 when we were climbing up
C、 while we climbed up
D、 when he climbed up
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