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    That isn't ring. It's eraser. A.an ,an B.a, a C. an, a D.a, an 【查看更多】

     

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    That  isn't _____ ring. It's _____ eraser.          
    [     ]
    A. an ,an
    B. a, a
    C. an, a
    D. a, an

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     That  isn't   _____ ring. It's  ____ eraser.

              A.an ,an         B.a, a                       C. an, a                         D.a, an

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