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
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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
单项选择题
He must have had an accident, or he ______ here then.
A．would have been
B．had been
C．should be
D．could be
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