莜面栲栳栳怎么炒:can't be和mustn'be的区别

来源：百度文库编辑：高考问答时间：2024/04/29 02:36:16

can't be和mustn'be的区别,我不懂,我现在初三做的题目为什么都用can't,从来不能选mustn'be,难道没有mustn'be吗?
例题:Li Hong _____ be in shanghai because I saw him in BeiJing only 10 minutes ago.
A.mustn'be B.can't
答案:B 为什么呢?请解释下,谢谢
我认为这是十分肯定的事,为什么不用mustn'be

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