is very important for us students to learn English well.A. ItB. AsC. WhatD. There

问题补充：

is very important for us students to learn English well.

A. It

B. As

C. What

D. There

答案：

(答案→)A. It

B. As

C. What

D. There

解析：考查it形式主语.本题的it是形式主语，真正的主语是后面的不定式to learn English well。在英语中能做形式主语或者形式宾语的只有it，故A正确。