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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