Itwasdifficulttotellexactly 国语站 题库 2.65W 大中小设置文字大小 问题详情: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 【回答】A知识点:连词题型:选择题 TAG标签:#