单项选择题

I think it is hard to _______what you said.

A．ensure
B．convince
C．agree
D．believe
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单项选择题
You'd better _______ the water until it has been boiled.
A．not to drink
B．not drink
C．not drunk
D．not drinking
单项选择题
It's necessary that the problem _______in some way or other.
A．is settled
B．was settled
C．be settled
D．has been settled
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