单项选择题

Without computer, we ______ great progress in the last decades.

A．should not have made
B．will not make
C．could not make
D．would not make
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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
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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