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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单项选择题
The mere fact ______ most people believe nuclear wars would be madness doesn't mean that it will not occur.
A．what
B．which
C．that
D．why
单项选择题
The doctor was asked to go back to the hospital because of ______ case.
A．an operation
B．an emergency
C．a treatment
D．an incident
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