单项选择题

When the new assembly line is complete, the factory will turn ______ one thousand cars per day.

A．in
B．off
C．out
D．over
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单项选择题
This platform would collapse if all of us ______ on it.
A．stand
B．stood
C．would stand
D．had stood
单项选择题
The young man who saw the car ______ into the river telephoned the police.
A．plunged
B．plunge
C．was plunging
D．to plunge
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