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Junk messaging has been a headache for years, __the action taken by the authori-ties has not yet produced the results expected

A.asB.butC.soD.before

B

解析试题分析:考查连词:句意:垃圾消息是多年以来一直让人头痛的事情,但是政府采取的行动还没有达到预想的效果。两句话是转折关系,用but,as正如,so因此,before在….前面,选B。
考点:考查连词

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