All possible means ____ to prevent the air pollution, but the sky is still not clear


  1. A.
    is used
  2. B.
    has been used
  3. C.
    are use
  4. D.
    have been used
D
試題分析：句意：所有可能能阻止大氣污染的方法都試過了 ，但是空氣依然不干凈。means單復(fù)數(shù)同形，在這里是復(fù)數(shù),這里強(qiáng)調(diào)過去的動作的影響所以用現(xiàn)在完成時更好。故選D。
考點(diǎn): 考查動詞時態(tài)的用法。
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A. they can persuade Iraq to continue oil production

B. they can have a talk with the U.N. Security Council

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