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    Millions of emails _ all over the world every day.

    A. send B. sent C. are sent D. were sent

    C 【解析】句意：每天有几百万封邮件发往世界各地。本题考查动词的时态和语态。Send派，送。A. send 原形 B. sent 一般过去时 C. are sent一般现在时被动语态 D. were sent一般过去时被动语态。邮件是动作的承受者，做句子的主语，故采用被动语态，排除A， B由every day.知为一般现在时，故选C
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