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— She looks rather upset. She        the exam.
— I guess so. It’s very difficult after all.
A.must have failedB.can fail
C.would have failedD.should fail
A               
             
试题分析:考查情态动词。句意 她看起来相当沮丧,肯定是考试不及格。我猜是,比较考试太难了。根据上文提到 She looks rather upset 现在看起来沮丧,下文表示对过去的肯定推测must have done ,所以选A项。        
考点 : 考查情态动词
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