定于从句练习The doctor did all_to save de wounded boy.A.what he could B.he could C.everything which he could D.for which he could 为啥选B?先行词all 在从句中做什么成分呢?为什么不是填he could do?

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定于从句练习The doctor did all_to save de wounded boy.A.what he could B.he could C.everything which he could D.for which he could 为啥选B?先行词all 在从句中做什么成分呢?为什么不是填he could do?
定于从句练习
The doctor did all_to save de wounded boy.
A.what he could B.he could C.everything which he could D.for which he could
为啥选B?先行词all 在从句中做什么成分呢?为什么不是填he could do?

定于从句练习The doctor did all_to save de wounded boy.A.what he could B.he could C.everything which he could D.for which he could 为啥选B?先行词all 在从句中做什么成分呢?为什么不是填he could do?
先行词在从句中是不做成分的,完整的从句是：
the doctor did all that he could did to save the wounded boy.
但是主语 the doctor 后面已经有一个did了,所以从句中的did被省略了,所以此处 he could 和 he could do 都可以,但是没有后者的选项,所以选B

选项里面没有he could do.
有的话也是可以的。

all在这里作宾语。这里could后面需要跟一个不定式来做补充，而绝不能跟动词。至于A中的what，我想你应该明白，这里定语从句的引导词是省略的，其他的就更离谱了。

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