◎ 题干
—We ______ talk loudly when we see the sign "Be quiet" on the wall.
—Yes, you are right.  We should be polite in public.
[     ]
A. must
B. mustn't
C. need
D. needn't
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—We______talk loudly when we see the sign "Be quiet" on the wall. —Yes, you are right. We should be polite in public.[ ]A. must B. mustn't C. need D. n…”主要考查了你对  【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。