matters most in learning English is enough practice. A. WhatB. WhyC. WhereD. Which

问题补充：

matters most in learning English is enough practice.

A. What

B. Why

C. Where

D. Which

答案：

(答案→)A. What

B. Why

C. Where

D. Which

解析：what在此引导主语从句，相当于the thing that。