The doctor did what he could (to save)the child.

问题描述:

The doctor did what he could (to save)the child.
为什么是to save?而不是是save?

看看完整的句子:
The doctor (主语)did(谓语) what he could (do可以承前省略)(宾语) to save the child(不定式短语作目的状语)
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