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
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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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