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While along the street, I met an old friend of mine.A.I walkingB.was walkingC.I

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While along the street, I met an old friend of mine.A.I walkingB.was walkingC.I

While ________ along the street, I met an old friend of mine.

A.I walking

B.was walking

C.I am walking

D.walking

试题答案

D