问题补充:
My mother my aunt called her.
A. was cooking while
B. cooked when
C. cooked while
D. was cooking when
答案:
A. was cooking while
B. cooked when
C. cooked while
(答案→)D. was cooking when
解析:考查时态。句意; 当阿姨打电话给我的时候,我的妈妈正在做饭。故用过去进行时。而call 是短暂动词,故用连词when。