It is he often fails in exams makes his parents worried about him.A. what；that.B. that；w

问题补充：

It is he often fails in exams makes his parents worried about him.

A. what；that.

B. that；what.

C. that；that.

D. because；that.

答案：

A. what；that.

B. that；what.

(答案→)C. that；that.

D. because；that.

解析：考查主语从句和强调句型。强调句型的基本结构为：It is/was被强调成分that/who其它成分。其最大的特点是把it is/was…that/who…去掉以后，句子仍然是成立的。本题强调的是that引导的主语从句，在名词性从句中that只起引导作用，在句中不充当任何成分。句意：就是他经常考试不及格才让他的父母亲很担心他。故C正确。