问题补充:
It is he often fails in exams makes his parents worried about him.
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。强调句型it is/was... that去掉后不影响句意,据此排除B;根据makes可知,that he often fails in exams是主语从句,he often fails in exams是主谓结构,不缺少成分,排除what;that引导主语从句时不能省略,排除D;故选C。