I me Mr Smith in the school library yesterday.--You are kidding .It --be him.He's gone back to

分类: 作业答案 • 2022-03-04 16:16:20

问题描述：

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

答

“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,