—Why did you leave without a word of warning to John?
—But what otherwise? He never listens to me.
A. could I have done
B. would I do
C. must I have done
D. should I do
网友回答
(答案→)A. could I have done
B. would I do
C. must I have done
D. should I do
解析：句意：--为什么你没有留下一句话就离开了？--但是要不我能做什么？他也不听我的。根据第一句可知这里他的离开发生在过去，故用情态动词+have done，所以排除BD；must have done不能用在疑问句中，故选A。