题目内容

We _______ talk loudly when we see the sign “ Be quiet ”on the right.
A．mustB．mustn’tC．needD．needn’t
B
看到be quiet 的标志，应该是表示要求或命令，选项中只有must表示此概念，根
据句义，安静应该是不准大声讲话，故选B，mustn’t。
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