单项选择题

______, Detroit was the home of the most productive automobile factories in the world.

A．At a time
B．At no time
C．At one time
D．In no time
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Pupils failing to ______ their homework are asked to stay after the class.
A．hand in
B．hand out
C．hand down
D．hand over
单项选择题
We are all in favor of your proposal that the discussion ______ .
A．be put off
B．was put off
C．should put off
D．is to put off
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