Question

—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

Answer 1

D

試題分析：句意：- 昨天我八點給你打電話是你在做什么？那時我正在彈鋼琴。at that time在那時，過去進行時的時間標志，其結構是：were/was+doing,故選D。