单项选择题

They ______ to have done such silly things.

A．had ought
B．hadn't ought
C．didn't ought
D．ought not
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It is because he is very devoted to his students ______ he is respected by them.
A．who
B．that
C．which
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单项选择题
How many computers will the company ______this year
A．turn up
B．turn on
C．turn out
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