I _____ along the street when I suddenly heard footsteps behind me.

A. am walking
B. had walked
C. had been walking
D. was walking
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科目：高中英語 來源：0110 期中題 題型：單選題

I _____ along the street when I suddenly heard footsteps behind me.
[     ]
A. am walking
B. had walked
C. had been walking
D. was walking

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