All possible means ____ to prevent the air pollution, but the sky is still not c
题型:不详难度:来源:
All possible means ____ to prevent the air pollution, but the sky is still not clear. A.is used | B.has been used | C.are use | D.have been used |
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答案
D |
解析
试题分析: 句意:所有可能能阻止大气污染的方法都试过了 ,但是空气依然不干净。means单复数同形,在这里是复数,这里强调过去的动作的影响所以用现在完成时更好。故选D。 考点: 考查动词时态的用法。 |
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