Question

—I didn't go to see the doctor yesterday.
　　  —But you________.  

A．ought

B．ought to

C．oughted to

D．ought to have

Answer 1

D

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。