it is in the library ,so you[ ]talk loudly.[ ]中填什么

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it is in the library ,so you[ ]talk loudly.[ ]中填什么

it is in the library ,so you[ ]talk loudly.[ ]中填什么
it is in the library ,so you[ ]talk loudly.[ ]中填什么

it is in the library ,so you[ ]talk loudly.[ ]中填什么
mustn’t
因为在图书馆小声说话是一项规定,所以是必须要执行的,用mustn't
can't表示不能,是指的一种能力