问题: 一道英语改错题
A chemistry teacher was standing by the desk,explaining the exercises to the students had done at home the day before.
有几种改法，说明理由． 谢啦！
解答:
A chemistry teacher was standing by the desk,explaining the exercises which had been done home the day before to the students .
which had been done home the day before 是修饰the exercises 的，应跟在其后面．
explaining有两个宾语，直接宾语the exercises ，间接宾语the students ．
我觉得这样层次就够清楚了．
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