问题描述：
Mr Smith insisted that he(had done)the work by himself,but nobody believed him.
The girl insisted that she (didn't see) the cell phone on the way to school.
为什么第一句用过去完成式而第二句用过去式呢?
The girl insisted that she (didn't see) the cell phone on the way to school.
为什么第一句用过去完成式而第二句用过去式呢?
问题解答：
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