单项选择题

—May I. use your pen, please—Sure.

A．Go ahead
B．Don't mention it
C．Certainly not
D．Not at all
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单项选择题
Try the experiment yourself ______you will know the reason.
A．so
B．and
C．or
D．unless
单项选择题
The streets are all day. It______ during the night.
A．can't have rained
B．mustn't have rained
C．couldn't rain
D．shouldn't have rained
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