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18.This ferryboat _____ to transport passengers between the harbor and the island for years.(  )
A.is usedB.was being usedC.is being usedD.has been used

分析 这个渡船多年来已用于港口,岛之间的旅客运输.

解答 答案是D. 考查被动语态,本句主语this ferryboat,与动词use是被动关系,根据时间状语for years"多年来",判断为现在完成时的句子,故答案选D.

点评 被动语态由"助动词be+及物动词的过去分词"构成.被动语态的时态变化只改变be的形式,过去分词部分不变.疑问式和否定式的变化也如此.掌握各种时态的被动语态是解题的关键.

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