单项选择题

It is imperative that students ______ their term papers on time.

A．hand in
B．would hand in
C．have to hand in
D．handed in
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单项选择题
______ stereophonic phonograph records, two recordings are made of the same musical performance.
A．Creates
B．Created
C．The creating of
D．To create
单项选择题
______ several times, they need some encouragement.
A．Being failed
B．Having failed
C．To fail
D．To be failed
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