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谁会这道题:—Youshouldn'thav—Youshouldn'thavetalkedbacktoourteacherlikethat.Itwasawfullyimpolite.—Youareright.Icrazyatthatmoment.[]A.mustbeB.couldhavebeenC.must

题目详情
谁会这道题:— You shouldn't hav
— You shouldn't have talked back to our teacher like that. It was awfully impolite.    
— You are right. I ______ crazy at that moment.
[      ]
A. must be      
B. could have been      
C. must have been  
D. should have been.

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答案和解析
C