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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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