问题
选择题
—I called you at about 8:30 last night, but nobody answered.
—Oh, I ________in my office at that time.
A. worked B. was working C. will work
答案
答案：B
题目分析：at that time在那时，指对方打电话的时候，故应该用过去进行时，was/were+doing,故选B