单项选择题

It's necessary that the problem ______ in some way or other.

A．is settled
B．be settled
C．was settled
D．has been settled
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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
单项选择题
It is because he is very devoted to his students ______ he is respected by them.
A．who
B．that
C．which
D．what
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