It was difficult to tell exactly _______ the saying began, but it is possible that it was in the the...
2022-12-07 16:03:40 28次 2014届江苏南通中学高三英语开学摸底考试英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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