Be polite.You ____ talk to the old like that

问题描述:

Be polite.You ____ talk to the old like that
A.couldn't B.mustn't
为什么不选C啊,couldn't不是有不可以的意思吗!

很高兴为您解答!
mustn`t"不行,不允许,不准”有禁止的意思
翻译:请礼貌点,你不准跟老人那样讲话
希望可以帮到您,