—When did Bob leave?
—I have no idea. I a shower upstairs.
A. took
B. have taken
C. was taking
D. would take
网友回答
A. took
B. have taken
(答案→)C. was taking
D. would take
解析：C 考察动词时态。句意：我不知道。当时我在楼上洗澡。根据句中的did可知，在Bob离开的那个时刻，我正在洗澡。过去进行时强调在过去的某个时间正在进行的动作。故C正确。