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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单项选择题
This is an ideal site for a university ______ it is far from the downtown area.
A．now that
B．as if
C．in that
D．even if
单项选择题
Pupils failing to ______ their homework are asked to stay after the class.
A．hand in
B．hand out
C．hand down
D．hand over
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