The doctor did all that he could to save the wounded boy.这句话中all在宾语从句中作什么成分?为什么?打错了：在定语从句中做什么成分？

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• The doctor did all that he could to save the wounded boy.这句话中all在宾语从句中作什么成分?为什么?
• The doctor did all that he could to save the wounded boy.这句话中all在宾语从句中作什么成分?为什么?打错了：在定语从句中做什么成分？
• 1.The doctor did all ____ to save the wounded boy填he could ,在这里是不是all 后面的that 可以省略呢来引导定从?2.Has ____ must be done been done?a.all b.all that c.that d.it这里为什么选B?如果修饰先行词 all的话,为什么不能像第一题那样省略 that 这2题区别在哪?第2题其他选项错在哪?
• The doctor did what he could （to save）the child.为什么是to save?而不是是save?