单项选择题

It is necessary that she ______ to the hospital at once.

A．send
B．was sent
C．have been sent
D．be sent
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单项选择题
The sun warms the earth, ______ makes it possible for plants to grow.
A．this
B．that
C．as
D．which
单项选择题
I can't support a policy ______ I have never approved.
A．with which
B．to which
C．for which
D．of which
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