While cleaning the room yesterday, I an old photo of my mother. A. came outB. came acros

While cleaning the room yesterday, I an old photo of my mother.
A. came out
B. came across
C. came about
D. came up with

A. came out(答案→)B. came acrossC. came aboutD. came up with解析：考查固定词组，came out意思“出现”，came across意思“遇然发现”，came about意思“发生”，came up with意思“想出”，句子意思“昨天当我打扫卫生时，我偶然发现我妈妈以前的照片”，注意when和while的区别：when后跟既可以是短暂性动词又可以是延续性动词；while后只跟延续性动词，所以选B

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