he did all __he can ___the old man A what to save B \ to help C \ save D what help

问题描述:

he did all __he can ___the old man A what to save B \ to help C \ save D what help
B 不多吧 ,选C

1.B \; to help
2 __he can 定语从句修饰all,省去that,并且can后省去了do
3.to help the old man目的状语嗯明白 前半部分 , 但是 为什么can 后 省略 了 do 呢因为he did all中有did,can后省就去了do