It was difficult to tell exactly the saying began but it is possible that it was in the

问题补充：

It was difficult to tell exactly the saying began, but it is possible that it was in the theatre or movie industry.

A. where

B. when

C. why

D. that

答案：

(答案→)A. where

B. when

C. why

D. that

解析：考查宾语从句：句意：很难辨别这种说法是在什么地方开始的，但是可能是在剧院或电影行业。Tell后面接的是宾语从句，根据句意和in the theatre or movie industry.可知是询问地点，选A。