Question

—John looks a bit upset.Did you tell him the bad news?

—Yes，but I________him after his birthday party.

A．should have told	B．must have told
C．shouldn’t have told	D．needn’t have told

Answer

A

【解析】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。