I my homework when the door bell .
A. did, rang
B. was doing, was ringing
C. did, was ring
D. was doing, rang
网友回答
A. did, rang
B. was doing, was ringing
C. did, was ring
(答案→)D. was doing, rang
解析：根据题干，本句的意思是“当门铃响的时候，我正在做作业。”当句中用when时，从句应用过去时，主句用过去进行时。所以本题选D。