-- What made her so upset? she failed in her examination.A. WhatB. ThatC. BecauseD. W

问题补充：

-- What made her so upset?

-- she failed in her examination.

A. What

B. That

C. Because

D. Whether

答案：

A. What

(答案→)B. That

C. Because

D. Whether

解析：考查主语从句。第一句是对主语进行提问，那么回答部分必须可以在句子中做主语。回答是一个完整的句子，所以需要加that构成主语从句。句意：--什么使她这么难过？--她考试没及格。故B正确。