单项选择题

As it turned out to be a small house party, we ______ so formally.

A．need not have dressed
B．must not have dressed
C．need not dress
D．must not dress
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单项选择题
He ______ unwisely, but he was at least trying to do something helpful.
A．may have acted
B．must have acted
C．should not act
D．would not act
单项选择题
The spokesman admitted that the government s thoughtless policy had caused a crisis that ______.
A．could never have happened
B．might have happened
C．should never have happened
D．would never have happened
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