-It is__he often fails in exams__makes his parents worries about him.
问题描述：
-It is__he often fails in exams__makes his parents worries about him.
-So,he has to work whole-heartedly
A.what that B.that what C .that that D./ that
选C 请问为什么
为什么不选D？
答
It is that he often fails in exams thatmakes his parents worries about himIt is 和第二个空的that 是强调句型.即去除it is ……that句子依然成立that he often fails in exams makes his parents worries about...