把状语改为不定式短语：the mother was pleased when she saw her son doing so well at school
问题描述：
把状语改为不定式短语：the mother was pleased when she saw her son doing so well at school
答
when she saw -----------------------to see
答
The mother was pleased to see her son doing so well at school。
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答
the mother was pleased to see her son doing so well at school