They can’t have been doing their homework,能不能改成下面句子
They isn't doing their homework
----------------改前和改后的句子除了语气不一样外,还有别的不一样吗?
人气：384 ℃ 时间：2020-03-29 18:44:16
解答
如果原句没有讲明时间的话,没有什么其他的区别.
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