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The teacher __ have thought Johnson was worth it or she wouldn't have wasted time on him, I suppose.

     A. should              B. can                C. would                  D. must

 

 

 

D

解析:考查情态动词的用法。根据句意,“我猜想,老师原来一定认为Johnson可以教化,否则她就不会在他身上浪费时间了。” 故选D项,must have done sth.表示对过去发生的事情很肯定的推测。

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