单项选择题

Since the introduction of the new technique, the production cost ______ greatly.

A．reduces
B．is reduced
C．is reducing
D．has been reduced
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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
单项选择题
By the time he arrives in Beijing, we ______ here for two days.
A．will have stayed
B．shall stay
C．have been staying
D．have stayed
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