单项选择题

I didn' t know what to do but then an idea suddenly ______ to me.

A．took place
B．occurred
C．happened
D．went
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单项选择题
Hardly ______ he entered the classroom when the rain began to fall in big drops.
A．he has
B．has he
C．he had
D．had he
单项选择题
What she suggested at the meeting was that we ______ cancel the original plan.
A．should
B．could
C．would
D．must
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