单项选择题

Five minutes eaflier, and we the last bus.

A．had caught
B．should have caught
C．could have caught
D．caught
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单项选择题
______ cease advertising, prices would be significantly reduced.
A．Were they to
B．Could they
C．If they
D．Would they
单项选择题
Much labor would have been saved if the electronic computers ______ before.
A．had invented
B．were invented
C．should have been invented
D．had been invented
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