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I me Mr Smith in the school library yesterday.--You are kidd

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I me Mr Smith in the school library yesterday.--You are kidding .It --be him.He's gone back to
England .A couldn't B can't
I me Mr Smith in the school library yesterday.--You are kidd
“不可能”,我们用can't.couldn't.尽管表示推测的时候,情态动词的时态与时间没有关系,但是一旦两个都出现的时候,还是要和时间状语联系起来进行选择.
yesterday有这个词,所以要选择A,