单项选择题

There are over 700 teachers in our college,（）60% are women teachers.

A．of whom
B．of them
C．where
D．which

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单项选择题
His parents asked him to buy books（）he found useful and necessary for his study.

A．whichever
B．whatever
C．whenever
D．however
单项选择题
It（）have rained last night, for the ground is wet.

A．will
B．can
C．should
D．must
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