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__________ yesterday afternoon ,a small tone flew out of a w

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__________ yesterday afternoon ,a small tone flew out of a window,and knockde him unconscious
A.As walking along the road
B.Walking along the road
C.When he was walking along the road
D.To walk along the road
是不是选C
__________ yesterday afternoon ,a small tone flew out of a w
如果选A,虽然as引导的状语从句可以表示“当……的时候”,但as后面总不能省略状语从句中的主语he的.如果选B,现在分词短语的逻辑主语一般要和全句的主语一致,而全句的主语是a small tone,所以不合题意.D选项时动词不定式短语,不能表示“当……时候”.
C选项是when引导的状语从句,并且符合题意,无语法错误.