It is _____ he often fails in exams____ makes his parents worried about him.
A．because；thatB．that；that
C．不填；thatD．what；that
B

試題分析：考查主語從句和強調句：首先第二個填that為強調句，It is ...that...中的that 為固定搭配，去掉It is ...that...來看，這是句子為That he often fails in exams makes his parents worried about him.在這一句中That he often fails in exams 為主句，這是個強調的主語從句，選B。
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