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
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单项选择题
______ several times, they need some encouragement.
A．Being failed
B．Having failed
C．To fail
D．To be failed
单项选择题
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before
B．until
C．since
D．when
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