专四

单选题Nancy's gone to work but her car's still there. She __________ by bus.

A．must have gone 
B．should have gone
C．ought to have gone 
D．could have gone

参考答案：A进入在线模考
【译文】南希已去上班，但她的车还在那儿。她一定是乘了公交车去的。
【解析】考查情态动词的用法。根据句意应选A，因为must have done表示对过去事情的肯定推测。B和C中should/ought to have done都表示本应该做某事却没有做；D中could have done表示本可以做某事却没有
做．显然均不符合题意。

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