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    I frustrated when I wasn’t sure of the correct answer. A. may be B. used to C. used to be D. use to be 【查看更多】

     

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    I ___________ frustrated when I wasn’t sure of the correct answer.

        A. may be       B. used to      C. used to be       D. use to be

     

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    I_________frustrated when I wasn't sure of the correct answer.     
    [     ]
    A. may be    
    B. used to    
    C. used to be    
    D. use to be

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    I _____ frustrated when I wasn't sure of the correct answer.   
    [     ]
    A. may be
    B. used to
    C. used to be
    D. use to be

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    I ___________ frustrated when I wasn’t sure of the correct answer.    
    [     ]
    A. may be          
    B. used to        
    C. used to be        
    D. use to be

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    I ___________ frustrated when I wasn’t sure of the correct answer.

        A. may be          B. used to         C. used to be         D. use to be

       

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