单项选择题

His motive for working so hard is that he needs money.

A. motivation
B. solution
C. motion
D. nature
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单项选择题
He tried to avoid the barrier to his carrying out the plan.
A. root
B. obstacle
C. danger
D. advantage
单项选择题
The stain on his shirt is sure not to vanish.
A. disappear
B. appear
C. mix
D. blend
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