—It is he often fails in exams makes his parents worried about him.—So he has to work who

问题补充：

—It is he often fails in 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：主要测试主语从句。首先可以从语境中得知句中的第二空主要测试强调句型：it is。。。That。。。结合所学判断强调句型的方法可以把以上结构去掉，而且句子成立。剩余句子he often fails in exams makes his parents worried about him中仍存在两套主谓结构，因此需要一个连接词，所以选择that。译文：------的确是他在测试中总失败让他的父母为他担心。------的确如此，他应该全力以赴的学习了。