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

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单项选择题
It（）have rained last night, for the ground is wet.

A．will
B．can
C．should
D．must
单项选择题
I don't think he is a man（）.

A．whom you can believe
B．that you can believe
C．whom you can believe in
D．what you can believe in
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