题目内容
—We ______ talk loudly when we see the sign "Be quiet" on the wall.
—Yes, you are right. We should be polite in public.
—Yes, you are right. We should be polite in public.
[ ]
A. must
B. mustn't
C. need
D. needn't
B. mustn't
C. need
D. needn't
B
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