---What made her so sad?---she had lost her purse with a lot of money in.A. BecauseB. Sinc

问题补充：

---What made her so sad?

---she had lost her purse with a lot of money in.

A. Because

B. Since

C. .What

D. That

答案：

A. Because

B. Since

C. .What

(答案→)D. That

解析：本试题答话部分是一个省略句。在这个句子中，That引导的是一个主语从句。