单项选择题

Everybody was looking for you when the meeting was over. You______with-not a word.

A．mustn't leave
B．shouldn't have left
C．couldn't have left
D．needn't leave
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单项选择题
He looks worried; I think he______in the exam.
A．must have failed
B．ought to have failed
C．should have failed
D．must fail
单项选择题
People always shake hands and say How do you do when______to each other.
A．introduced
B．introducing
C．introduce
D．to be introducing
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