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
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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
单项选择题
Many of the human problems associated with living in the ocean are ______ the problems of living in outer space.
A．just as
B．such as
C．such that
D．the same as
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