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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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
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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