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The local area network also connects to a wide area network that allow a message ( ) across the country or to countries.
A. send
B. sending
C. to be sent
D. is sent
B. sending
C. to be sent
D. is sent
参考答案
参考解析
解析：考查非谓语动词。allow sb/sth to do，后面接的是不定式，只有C项用了不定式，且message是被发射出去的，所以要用被动语态，ABD选项均不符合。
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