parents say and do has a life-long effect on their children. A. ThatB. WhichC. WhatD. As

问题补充：

parents say and do has a life-long effect on their children.

A. That

B. Which

C. What

D. As

答案：

A. That

B. Which

(答案→)C. What

D. As

解析：what在此引导主语从句，相当于the thing that。