In order to make the separate family reunited，he did them.（Which one of the following is wrong？）
A. all he could to help
B. everything possible to help
C. his best to help
D. what he could help
网友回答
A. all he could to help
B. everything possible to help
C. his best to help
(答案→)D. what he could help
解析：A项为省略句，全句应为：he did all he could do to help them。to help为目的状语，A是正确的。B项中形容词置于everything之前，也无错误。C项do one’s best to是习语，也常为人所用。D项中的错误在于help前少了to。to help表目的。