单项选择题

It's (high) time they (begin) to take you seriously (and) they know (it).

A．high
B．begin
C．and
D．it
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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
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
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