Question

---Why hasn’t Jane arrived yet?  
---She ______ again in the morning.

A．shouldn’t have overslept

B．may have turned off the alarm clock

C．must have no one to call her

D．should have someone to wake her up

Answer 1

B

试题分析：考查情态动词的完成式：句意：对不起。我迟到了。我可能是把闹钟关了，又睡回笼觉了。might 表示“有可能...”。  might have done sth. 是常用句型，表示在过去可能做了什么。用should（n’t） have done就表示“过去（不）应该做而没做（做了）”，must have done过去一定做了，选B。