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。
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