单项选择题

______ to the doctor right away, he might have been alive today.

A．If he went
B．Were he gone
C．Should he have gone
D．Had he gone
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单项选择题
______ some of the tasks done by man before, computers are sometimes called thinking machines.
A．Taking over
B．To have taken over
C．To take over
D．To be taken over
单项选择题
Only when he had done it ______ that he had made a mistake.
A．he then realized
B．did he realize
C．before he realized
D．he realized
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