单项选择题

So long as we put our heads together, I'm sure that we will certainly find a(n) ______ to the problem.

A．approach
B．key
C．answer
D．solution
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His dedication ______ the cause of education earned him the respect of his colleagues.
A．to
B．about
C．in
D．into
单项选择题
The puppet power only survived the riotous (造反的) officer ______.
A．with six days
B．by six days
C．during six days
D．in six days
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