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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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
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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