单项选择题

I wonder who first conceived the idea of cutting a hole in the door.

A. thought of
B. came on
C. gave up
D. handed out
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单项选择题
Mary had sold her bike, taken a driving test and bought a car.
A. examination
B. quiz
C. exercise
D. check
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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