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

问题补充：

It is difficult to tell exactly the saying began, but it is probable that it was in the theater 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：句意：很难以确切的分辨出这个俗语出自哪里，但是它很可能来自电影行业。tell之后引导宾语从句，根据意思判断应该是where引导的宾语从句。故选A.

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