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?](/uploads/image/z/13492201-49-1.jpg?t=%E5%AE%9A%E4%BA%8E%E4%BB%8E%E5%8F%A5%E7%BB%83%E4%B9%A0The+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+%E4%B8%BA%E5%95%A5%E9%80%89B%3F%E5%85%88%E8%A1%8C%E8%AF%8Dall+%E5%9C%A8%E4%BB%8E%E5%8F%A5%E4%B8%AD%E5%81%9A%E4%BB%80%E4%B9%88%E6%88%90%E5%88%86%E5%91%A2%3F%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AF%E5%A1%ABhe+could+do%3F)
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。