稀奶油和淡奶油哪个好:can't be和mustn'be的区别

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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'tbe,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 be
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

can't be和mustn'be的区别 can't be和mustn'be的区别 can't be和mustn'be的区别 can't be和mustn'be的区别(急) I mustn't be+人名对不对情态动词的can't和mustn't的区别 mustn't have done和can't have done 的区别? The key __ be Peter's.His is still in the lock.A, can't B.mustn't can't be helped 关于mustn't