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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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
I opened a letter and it contained______
A．a important information
B．an important information
C．the important information
D．important information
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