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
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
______ now, she should catch the train to Paris.
A．Would she set off
B．Was she setting off
C．Were she to set off
D．If she sets off
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