9.Mary is very late,she ______.A.may miss her train B.may have missed her train C.must miss her train D.could miss her train 为什么不能选C?

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9.Mary is very late,she ______.A.may miss her train B.may have missed her train C.must miss her train D.could miss her train 为什么不能选C?

9.Mary is very late,she ______.A.may miss her train B.may have missed her train C.must miss her train D.could miss her train 为什么不能选C?
9.Mary is very late,she ______.
A.may miss her train B.may have missed her train
C.must miss her train D.could miss her train
为什么不能选C?

9.Mary is very late,she ______.A.may miss her train B.may have missed her train C.must miss her train D.could miss her train 为什么不能选C?
因为错过了火车只是其中一种可能性,所以不能填must

意思不通,这里must是必须的意思,must have才是也许的意思,可以说
she must have missed her train.

选C,must是说话人对自己推测的肯定性

此题选B。C不对是因为没有用完成时表对过去的推测。
Must have done 表示对过去事情的肯定的推测,在句子当中要有事实依据的,所以此题C改成must have missed her train也是可以的,只不过和B相比更肯定写些。

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