My mother my aunt called her.A. was cooking whileB. cooked whenC. cooked whileD. was cook

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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。