问题补充:
—What were you doing when I called you at 8 p.m. yesterday?
—I the piano at that time.
A. play
B. is playing
C. played
D. was playing
答案:
A. play
B. is playing
C. played
(答案→)D. was playing
解析:句意:- 昨天我八点给你打电话是你在做什么?那时我正在弹钢琴。at that time在那时,过去进行时的时间标志,其结构是:were/was+doing,故选D。