The reason he felt frustrated was he lost his MP4.A. why/thatB. that/whyC. why/becauseD.

问题补充：

The reason he felt frustrated was he lost his MP4.

A. why/that

B. that/why

C. why/because

D. that / because

答案：

(答案→)A. why/that

B. that/why

C. why/because

D. that / because

解析：句意：他郁闷的原因是他丢了他的MP4。The reason why…is/was that…意为：…….的原因是……。why he felt frustrated是定语从句修饰the reason，that he lost his MP4是表语从句。故选A。

考点: 考查名词性从句的用法。