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
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
单项选择题
The human body is composed of organs, each （） a definite job to do.

A．have
B．has
C．to have
D．having
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