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


  1. A.
    as
  2. B.
    but
  3. C.
    so
  4. D.
    before
B
試題分析：考查連詞：句意：垃圾消息是多年以來一直讓人頭痛的事情，但是政府采取的行動還沒有達(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。
考點(diǎn)：考查連詞
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