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 walking
B.was walking
C.I am walking
D.walking
试题答案
D

While ________ along the street, I met an old friend of mine.
A.I walking
B.was walking
C.I am walking
D.walking
D