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    A number of experts________invited，but the number of the experts who attended the conference_______ only 20.

    A. were；was     B. was；were 　　  C. was；was　　 D.  were；were

     

    答案：A
    提示：

    a number of+名词复数，“许多”，谓语动词用复数；the number of...的数量，谓语动词用单数。

     


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