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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：在國慶節(jié)期間，也許百萬的游客將來中國。millions of…表示百萬……；后加名詞的復數，million表示百萬，前面有具體數字的時候，不能變復數。根據題意，故選D。
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