We ______ talk loudly in the library.A.must B.mustn't C.can D.can't

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We ______ talk loudly in the library.A.must B.mustn't C.can D.can't

We ______ talk loudly in the library.A.must B.mustn't C.can D.can't
We ______ talk loudly in the library.A.must B.mustn't C.can D.can't

We ______ talk loudly in the library.A.must B.mustn't C.can D.can't
答案:【mustn't 】图书馆禁止大声喧哗
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We _B___ talk loudly in the library.A.must B.mustn't C.can D.can't

B表示在道理上不可以,是正确地,c是不能,没有这个能力,是不正确的