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-Why is your professor so happy recently?-Because the theory she insisted on cor

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-Why is your professor so happy recently?-Because the theory she insisted on cor

—Why is your professor so happy recently?
—Because the theory she insisted on         correct. [     ]A. is proved    
B. proving    
C. was proved  
D. has proved

试题答案

D

标签：recentlyhappythebecauseso

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