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13、

－Dick performed wonderfully at the concert last weekend.   

－Ye s. He            very carefully before it.   

A. must have prepared                                             B. couldn’t have prepared  

C. must prepare                                                      D. could prepare  

 

 

13、A

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－Dick performed wonderfully at the concert last weekend.   

－Ye s. He            very carefully before it.   

A. must have prepared                                             B. couldn’t have prepared  

C. must prepare                                                      D. could prepare  

 

 

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