问题
选择题
We _______ talk loudly when we see the sign "Be quiet" on the wall. [ ]
A. must
B. mustn't
C. need
D. needn't
答案
答案：B
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We _______ talk loudly when we see the sign "Be quiet" on the wall. [ ]
A. must
B. mustn't
C. need
D. needn't
答案：B
