单项选择题

No sooner had he reached the top of the hill（）he sat down to rest.

A．then
B．than
C．until
D．when

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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

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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