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4.They put forward a proposal at the meeting        cutting down the high housing price.(  )
A.aims atB.aimed atC.to aim atD.aim at

分析 他们在会上提出一项建议,旨在降低居高不下的房价.

解答 答案:B 题干中cutting down the high housing price是作目的状语,要用非谓语动词;aim sth at…以…为目标,proposal与aim之间构成动宾关系,要用被动.故选B.

点评 过去分词是非谓语动词的一种,用法很灵活,分为简单式done(表示与谓语同时或几乎同时发生的动作);完成式having been done(表示先于谓语的动作).学习时,要把握其用法特征:表示被动和完成.同时还要注意区分现在分词和不定式.

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