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    The number of the workers here ___ 200. Half of them ____under 30 years old.

    A. are, are B. is, are C. are, is D. is, is

     

    B

    【解析】

    试题分析：句意为：这里工人的数量是200人，一半在30岁以下。the number of+名词复数，表示“---的数量”，谓语动词应用第三人称单数形式。结合语境，“ half of them”指的是一半的工人，表示多数。根据主谓一致原则可知应选B。

    考点：考查be动词的用法。

     

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