he did all __he can ___the old man A what to save B \ to help C \ save D what help第一个空为什么不填 what

he did all __he can ___the old man A what to save B \ to help C \ save D what help第一个空为什么不填 what
he did all __he can ___the old man A what to save B \ to help C \ save D what help
第一个空为什么不填 what

he did all __he can ___the old man A what to save B \ to help C \ save D what help第一个空为什么不填 what
选B 这是定语从句,定语从句这里先行词做宾语省略了
如果没有all 才可以用what ,那样的话是一个宾语从句 he diid what he can

因为这句话all 是do的宾语了，不必再加关系代词what来充当宾语了
all解释所有的，作宾语
改what：
he did what he can to save...........
选B
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定语从句引导词没有what

all在这里是代词，后面用that来修饰定语从句。