题目内容
把下面的状语从句改为不定式短语
The mother was pleased when she saw her son doing so well at school．
答案：
解析：
解析：
The mother was pleased to see her son doing so well at school．
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题目内容
把下面的状语从句改为不定式短语
The mother was pleased when she saw her son doing so well at school．
The mother was pleased to see her son doing so well at school．