单项选择题

I had been puzzled over the problem for over an hour without any result when all at once the solution______ across my mind.

A．flushed
B．flickered
C．flared
D．flashed
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单项选择题
They______ us willingly but that they happened to be short of hands, too.
A．would help
B．would have helped
C．were going to help
D．must have helped
单项选择题
______ the practice, the best rule is the one that works.
A．As regards
B．As regard to
C．As regards with
D．In regard to
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