Question

— I called you yesterday but no one answered.
— Well, Maybe I         in the garden at that time.

A．worked

B．am working

C．was working

D．would work

Answer 1

C

考察时态。句意：我昨天给你打电话了，但是没人接。——哦，可能那个时候我正在花园里面忙。结合语境可知下文，描述的是过去某时正在进行的动作，故用过去进行时态。at that time是过去进行时的标志。选C。