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

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单项选择题

I don't think it advisable that Tom ______ to the job since he has no experience.

A．be assigned
B．is assigned
C．will be assigned
D．has been assigned

单项选择题

So many representatives ______, the conference had to be put off.

A．were absent
B．to be absent
C．being absent
D．had been absent

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