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    A variety of butterflies flying in the jungle, one of which is a very rare one. A. is B. have been C. are D. has been 【查看更多】

     

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    A variety of butterflies ________ flying in the jungle, one of which is a very rare one.

    A. is              B. have been         C. are            D. has been

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    A variety of butterflies ________ flying in the jungle, one of which is a very rare one.
    [     ] 

    A. is              
    B. have been        
    C. are            
    D. has been

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