单项选择题

Tom is one of the boys who（）on time.

A．are
B．is
C．have
D．has

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单项选择题
It（）for a week and the streets were flooded.

A．has rained
B．had been raining
C．was raining
D．rained
单项选择题
We proposed that work（）at once.

A．start
B．starts
C．will start
D．started
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