Question

---John looks a bit upset.Did you tell him the bad news?
---Yes，but I________him after his birthday party

1. A.
   should have told　　　
2. B.
   must have told
3. C.
   shouldn’t have told　　　
4. D.
   needn’t have told

Answer 1

A
这题考查情态动词的完成式的用法：should have told“本应该做却没做”must have done“过去一定做了”，shouldn’t have told“本不应该做却做了”needn’t have told“本不必做某事却做了”，句意是：--约翰看上去有点不安，你告诉他坏消息了吗？--是的，但我不该在他生日的时候告诉他。选A。