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

问题补充：

— 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

答案：

A. worked

B. am working

(答案→)C. was working

D. would work

解析：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。