Question

______ is of great importance now , my teacher often reminds me ,is study.

A．It

B． As

C．What

D．Which

Answer 1

C

试题分析：考查主语从句：句意：我的老师经常提醒我，现在最重要的是学习。my teacher often reminds me ,是插入语，可以先不看，剩下的内容可知第二个is前面的是主语从句，主语从句缺少主语，用what引导主语从句，选C。