We have a lot of homework to do today. So we need two or three hours to finish them.改错答案上是them改为it 但我不明白,麻烦解答

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We have a lot of homework to do today. So we need two or three hours to finish them.改错答案上是them改为it 但我不明白,麻烦解答
We have a lot of homework to do today. So we need two or three hours to finish them.改错
答案上是them改为it 但我不明白,麻烦解答

We have a lot of homework to do today. So we need two or three hours to finish them.改错答案上是them改为it 但我不明白,麻烦解答
homework是不可数名词 没有复数形式 所以不可以用them 而用it