His play was popular and every time about it, he owed his success to the support of his fr

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(答案→)A. talking
B. talked
C. to talk
D. when talking
解析：考查分词做状语。Talk about it与he构成主动关系，故使用现在分词做状语。D项的when与every time重复。句意：他的戏剧非常受欢迎，每次谈论的时候，他都把成功归功于朋友的支持。