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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:高中英语 来源:0110 期中题 题型:单选题

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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