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
Only by doing so ______ the right way of delivering a successful speech.
A．you can find
B．you will find
C．would you find
D．can you find
单项选择题
She ______ her achievement to her intelligence and hard work.
A．said
B．gave
C．owed
D．referred
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