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

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A. you ask for
(答案→)B. ask for
C. asking for
D. to ask for
解析：句意：当你处于危险当中时，为什么不请求帮助？固定句式why not do sth，为什么不做某事，表示用来提出某种建议等，注意not后面接动词原形，故选B。