________________, I was so careless that it got loose and was hit by a carA.While I walked the dogB.While I walking the dogC.While walking the dogD.While I am walking the dog
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C解析考查状语从句的省略式，英语中，主从句deep主语一致可以省略从句的主语和be动词While walking the dog= While I was walking the dog，句意是：我在遛狗的时候很粗心，松开它，结果被车撞了。选C。