问题
选择题
—I called you at 6 o'clock yesterday evening, but nobody answered.
— I'm sorry. I my friend download the movie Kung Fu PandaⅡwhen the telephone rang,
A. would help B. helped C. was helping
答案
答案：C
考查动词时态 上下语境都是过去时，这里强调电话响时我正在帮助，所以用过去进行时。