— Thank you so much for saving my son and bringing him home.— Don’t mention it. I only did

问题补充：

— Thank you so much for saving my son and bringing him home.

— Don’t mention it. I only did what anyone else in my place.

A. must do

B. should do

C. may have done

D. would have done

答案：

A. must do

B. should do

C. may have done

(答案→)D. would have done

解析：考查虚拟语气。句意：谢谢你救了我儿子并把他带回家。——不客气。我只是做了其它任何人处在我的位置都会做的事情。“would+have+done”表示对过去事情的假设，意思是“本来会做”。故选D