—I didnt go to see the doctor yesterday. 　　 —But you. A. ought B. ought to C. oughted to

问题补充：

—I didn go to see the doctor yesterday.

—But you.

A. ought

B. ought to

C. oughted to

D. ought to have

答案：

A. ought

B. ought to

C. oughted to

(答案→)D. ought to have

解析：从对话中可以看得出来,双方谈论的话题是过去的事,故应用ought to have +过去分词,省略时,则须在to之前加上have。错选B者主要是没注意到句中的yesterday,是表过去,而非现在。