问题描述:
the man must have visited the city. No,he couldn't have,because he didn't have any time
上面那个couldn't也可以换成Can't吗?
如果可以有什么不同呢?
谢谢大家
上面那个couldn't也可以换成Can't吗?
如果可以有什么不同呢?
谢谢大家
问题解答:
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