— Amy I called you yesterday evening but nobody answered the phone.— Oh I a walk with

问题补充：

— Amy, I called you yesterday evening, but nobody answered the phone.

— Oh, I a walk with my mother at that time.

A. take

B. took

C. am taking

D. was taking

答案：

A. take

B. took

C. am taking

(答案→)D. was taking

解析：时态考查题。这是两个人之间的对话，第一个人说：“Amy，我昨天晚上给你打电话，但是没有人接电话。”第二个人说：“我在那个时候正在和我的妈妈散步”。根据上下文语境，在过去的某一时间，正在做某事，要用过去进行时，故选D。