—I phoned you at 7 yesterday evening but nobody answered.
— Oh, I my dog in the park then.
A. walked
B. was walking
C. had walked
D. would walk
网友回答
A. walked
(答案→)B. was walking
C. had walked
D. would walk
解析：考察时态。根据then可知是指在过去的某个时间点，那么应该使用过去进行时表示在过去某个时间点上发生的事情。故B正确。