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    (1)A number of books on the subject. A. published B. has been published C. have been published D. have published (2)The number of students in that class small. A. are B. is C. have been D. were 【查看更多】

     

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     A number of books ________ on the subject

          A published   B has been published    C have been published  D have published

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    A number of books ________ on the subject．

    [　　]

    A．published

    B．has been published

    C．have been published

    D．have published

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