-I called you at 2:00pm yesterday but there was no answer.-Oh sorry! I in the garden at

问题补充：

-I called you at 2:00pm yesterday, but there was no answer.

-Oh, sorry! I in the garden at that time.

A. am working

B. worked

C. was working

D. will work

答案：

A. am working

B. worked

(答案→)C. was working

D. will work

解析：此题重点考查过去进行时的基本用法，表示在过去某个时刻正在进行的动作或存在的某种状态。根据语境可知此句的含义在昨天的那个时候我在花园里工作。故用过去进行时。过去进行时的基本构成是was或were+ving，故选C。