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    ( ) There are usually days in February. A. twenty-eight B. twenty-nine C. thirty D. thirty-one 【查看更多】

     

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    There are usually (通常) ________ days in February.
    [     ]
    A. thirty-one
    B. twenty-nine  
    C. thirty
    D. twenty-eight

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    There are (有) usually ________ days in February.

    [　　]

    A．thirty
    B．thirty-one
    C．twenty-eight
    D．twenty-nine

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