We _______ talk loudly when we see the sign “ Be quiet ”on the right. A．mustB．mu
题型：不详难度：来源：
We _______ talk loudly when we see the sign “ Be quiet ”on the right. | A．must | B．mustn’t | C．need | D．needn’t |
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答案
| B |
解析
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。 |
举一反三
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