单项选择题

It suddenly_________ to me that we could use a computer to do the job.

A．happened
B．occurred
C．agreed
D．presented
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单项选择题
In no case_________ the students from exploring new ideas.
A．we should prevent
B．we could prevent
C．should we prevent
D．shouldn’t prevent
单项选择题
With all this work on hand, she_________ to the dance party last night.
A．oughtn’t to go
B．hadn’t gone
C．shouldn’t have gone
D．mustn’t have gone
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