—Were you at home at 9:00 last night? I called you but nobody answered.
—Sorry, I at that time.
A. take a shower
B. took a shower
C. was taking a shower
D. am taking a shower
网友回答
A. take a shower
B. took a shower
(答案→)C. was taking a shower
D. am taking a shower
解析：句意：昨晚九点钟你在家吗啊？我给你打电话了，但是没有人接。——抱歉，那个时侯我正在洗澡。结合语境可知下文描述的是过去某时正在进行的动作，故用过去进行时态，选C。