问题补充:
------ It is he often fails in the exams makes his parents worried about him.
------ So, he has to work whole- heartedly.
A. what; that
B. that; what
C. that; that
D. / ; that
答案:
A. what; that
B. that; what
(答案→)C. that; that
D. / ; that
解析: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。