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?
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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。