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问题: The doctor did what he could do an operation on the badly wounded soldier.


改错
The doctor did what he could do an operation on the badly wounded soldier.

解答:

the doctor did what he could an operation on the badly wounded soldier.

个人拙见.在的do 后加 to. the doctor did what he could to do an operation the .....
what he could.... 是由 关系代词引导的宾语从句,could 后省略了 do 以避免重复。 to do an operation.....是不定式短语做目的状语。