There was time Iraq was one of the strongest countries in the world.A. a；whenB. a；thatC. t

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(答案→)A. a；when
B. a；that
C. the；that
D. the；when
解析：考查定语从句。此定语从句为固定句型：There was a time when ，曾经有一段时间，曾经有一段时间伊朗是世界上最强大的国家之一。所以选A。