-----I called you at about half past eight last night but nobody answered.---Oh I in

问题补充：

-----I called you at about half past eight last night but nobody answered.

-----Oh, I in my office at that time.

A. will work

B. had worked

C. worked

D. was working

答案：

A. will work

B. had worked

C. worked

(答案→)D. was working

解析：考查时态。句意：昨天晚上大约八点半卧给你打电话了但是没人接。噢，在那时我正在办公室工作。在过去某一时刻正在进行的动作应用过去进行时态。所以选D。