---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
B

試題分析：考查情態(tài)動詞的完成式：句意：對不起。我遲到了。我可能是把鬧鐘關(guān)了，又睡回籠覺了。might 表示“有可能...”。  might have done sth. 是常用句型，表示在過去可能做了什么。用should（n’t） have done就表示“過去（不）應該做而沒做（做了）”，must have done過去一定做了，選B。
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