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

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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。