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单项选择题

He（）at the meeting this morning．Hewas in hospital at the time．

A．couldn’t have spoken
B．mustn’thave spoken
C．shouldn’t have spoken
D．needn’thave spoken

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单项选择题

He（）you more help，eventhough he was very busy．

A．might have given
B．might give
C．may have given
D．may give
单项选择题

Not even one of the hundred students who took the test（）passed．

A．has
B．have
C．is
D．are
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