为什么这个句子情态动词后面可以用不定式?The doctor did what he could to save the girl who was badly hurt in the accident.

分类: 作业答案 • 2021-12-28 16:00:30

问题描述：

答

是could后省略了do,因为前面主句谓语为did.
The doctor did what he could(省略do) to save the girl who was badly hurt in the accident.