单项选择题
The old woman______ the bus stop saw the accident.
A．waiting at
B．getting up
C．coming in
D．keeping up
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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
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