Junk messaging has been a headache for years, ＿＿the action taken by the authori-ties has not yet produced the results expected
A．a(chǎn)sB．butC．soD．before
B

試題分析：考查連詞：句意：垃圾消息是多年以來(lái)一直讓人頭痛的事情，但是政府采取的行動(dòng)還沒(méi)有達(dá)到預(yù)想的效果。兩句話是轉(zhuǎn)折關(guān)系，用but，as正如，so因此，before在….前面，選B。
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