单项选择题

You ______ ask a woman her age. It’s not polite.

A. mustn’t
B. needn’t
C. won’t
D. may not
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单项选择题
The operator pressed the switch and the lights ______ on.
A. would come
B. came
C. were coming
D. had come
单项选择题
______ the 8:20 bus because he didn’t leave home till 8:25.
A. couldn’t have caught
B. shouldn’t have caught
C. ought to have caught
D. must not have caught
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