It is he often fails in exams makes his parents worried about him.A. because；thatB. that；

问题补充：

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

A. because；that

B. that；that

C. 不填；that

D. what；that

答案：

A. because；that

(答案→)B. that；that

C. 不填；that

D. what；that

解析：考查主语从句和强调句：首先第二个填that为强调句，It is ...that...中的that 为固定搭配，去掉It is ...that...来看，这是句子为That he often fails in exams makes his parents worried about him.在这一句中That he often fails in exams 为主句，这是个强调的主语从句，选B。