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    During the National Day holiday, ______ visitors will come to China, perhaps.

    A. million of B. several millions C. 5 million of D. millions of

    D 【解析】 句意：在国庆节期间，也许百万的游客将来中国。millions of…表示百万……；后加名词的复数，million表示百万，前面有具体数字的时候，不能变复数。根据题意，故选D。
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