Why not help when you were in trouble?A. you ask forB. ask forC. asking forD. asks for

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A. you ask for
(答案→)B. ask for
C. asking for
D. asks for
解析：why not do sth.？表示“为什么不做某事？”是固定句型。本题的意思是“当你在困难中的时候，为什么不寻求帮助呀？”所以本题选B。