Millions of emails _ all over the world every day.

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

C 【解析】句意：每天有幾百萬封郵件發(fā)往世界各地。本題考查動(dòng)詞的時(shí)態(tài)和語態(tài)。Send派，送。A. send 原形 B. sent 一般過去時(shí) C. are sent一般現(xiàn)在時(shí)被動(dòng)語態(tài) D. were sent一般過去時(shí)被動(dòng)語態(tài)。郵件是動(dòng)作的承受者，做句子的主語，故采用被動(dòng)語態(tài)，排除A， B由every day.知為一般現(xiàn)在時(shí)，故選C
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