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 1

A

考查虚拟语气。Should have done sth本应该做某事实际上却未坐；must have done一定做了某事；shouldn’t have done本不应该做某事，实际上却做了。Needn’t have done本不需要做某事，实际上却做了。句意—John看上去有点难过。你把那个坏消息告诉他了？—是的。可我本应该是在生日聚会以后在告诉他的。根据句意说明A正确。
点评：虚拟语气的考查重点要关注if条件句的虚拟语气，不同的时态使用不同的形式。