The reason so many people rushed to California was another gold mine was found in Califor

问题补充：

The reason so many people rushed to California was another gold mine was found in California.

A. that; because

B. why; that

C. that; why

D. why; because

答案：

A. that; because

(答案→)B. why; that

C. that; why

D. why; because

解析：考查句型：the reason why … is that, …的原因是，第一个空为why引导的定语从句，第二个空为that引导的表语从句。故选B。