He can't be in the classroom,I saw him go home a minute ago 我想问一下问什么不能用mustn't而用can't?
人气：142 ℃ 时间：2020-01-29 08:57:35
解答
因为表示英语中“不可能”不能用mustn't而要用can't,mustn't是不允许的意思.
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