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
（） 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
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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