问题描述:
有关状语从句
she saw it happen when she was walking past.我知道这个句子还可以写成 she saw it happen when walking past.但是这个属于哪个语法点呢?
she saw it happen when she was walking past.我知道这个句子还可以写成 she saw it happen when walking past.但是这个属于哪个语法点呢?
问题解答:
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