单项选择题

We have to think very carefully before we take any action, because it's a very serious situation we have encountered.

A. ideal
B. favourable
C. good
D. severe
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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
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
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