We talk loudly when we see the sign on the right must mustn't need needn't 答案选mustn't ,谁可以帮解答

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We talk loudly when we see the sign on the right
must mustn't need needn't
答案选mustn't ,谁可以帮解答

mustn't 表禁止.首先要读懂句子的意思——当我们看到右边的标识时,我们不能大声说话.
标志里有的是Don`t speaking 之类的.
must和need不符合句意,needn't表没必要.

当我们看到右边的标志,我们一定不能大声讲话。
这里表示的是禁止