单项选择题

Little ______ that he had mane a terrible mistake.

A．he realized
B．does he realize
C．did he realize
D．didn't realize
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单项选择题
In spite of difficulties, she ______ in her efforts to get a MBA.
A．resisted
B．persisted
C．remained
D．endured
单项选择题
The experiment turned ______ to be a total failure.
A．in
B．out
C．on
D．over
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