Question

------ It is         he often fails in the exams          makes his parents worried about him.
------ So, he has to work whole- heartedly

1. A.
   what; that
2. B.
   that; what
3. C.
   that; that
4. D.
   / ; that

Answer 1

C
试题分析：考查强调句型和主语从句。从结构可知第一个空是主语从句，句子意思完整不缺少成分，所以用that引导，而第二个空根据特点判断是强调句型，即把it is …that去掉句子完整，句意：---他经常考试不及格让他父母对他很担心。--这么看来，他得全力投入学习了。
考点：考查强调句型和主语从句。