应该是
把them改为they
做从句的主语,不能用宾格,要用主格
在那时我看到他们正在扫地
l saw them were sweeping the floor at that time
l saw them were sweeping the floor at that time
找出错误并改正
找出错误并改正
英语人气：563 ℃时间：2019-12-17 12:28:37
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