i fell off the bike_A.while riding B.while i am riding C.while i rode选哪

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i fell off the bike_A.while riding B.while i am riding C.while i rode选哪

i fell off the bike_A.while riding B.while i am riding C.while i rode选哪
i fell off the bike_A.while riding B.while i am riding C.while i rode选哪

i fell off the bike_A.while riding B.while i am riding C.while i rode选哪
A.while riding 当主语的人和从句一致时,从句的主语和be动词可以省略

A