单项选择题

It took me a whole hour to solve the problem.

A. work at
B. work on
C. work out
D. work over
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单项选择题
Tom is still full of beans at 70.
A. courageous
B. kind
C. energetic
D. single
单项选择题
I didn't help him. I would have, however, I didn't have the money.
A. or
B. but
C. otherwise
D. still
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