----If this had happened to you, what would you have done?
----Me? I the alarm.
A. would turn on
B. would have turned on
C. had turned on
D. must have turned on
网友回答
A. would turn on
(答案→)B. would have turned on
C. had turned on
D. must have turned on
解析：考查虚拟语气。根据前一句中条件句中使用“过去完成时”；后面的主句使用“情态动词+have done”表示本句是与过去事实相反的虚拟语气，根据第二句也是与过去事实相反，使用“情态动词+have done”的形式。句意：—如果这一切发生在你的身上，你会做什么？—我。我会把闹钟关掉。故B正确。