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14.People are recycling many things which they       away in the past.(  )
A.had thrownB.will be throwing
C.were throwingD.would have thrown

分析 句意为:人们正在回收利用他们过去常常会扔掉的东西.

解答 答案:D 
这句话的which引导的是定语从句,是一个隐含的虚拟语气,因为in the past相当于If they had been in the past,所以句子用虚拟语气,和过去相反主句用would have done.所以选D.

点评 要能看出句中有虚拟语气(含蓄的),如果过去事实相反,条件句中使用过去完成时,主句使用"情态动词+have done";如果主句与现在事实相反,条件句中使用过去时,be动词使用were,主句中使用"情态动词+动词原形";如果与将来事实相反,条件句中有三种:过去时;were to do;should+动词原形,主句使用"情态动词+动词原形";要特别注意如果省略了if,句子要使用部分倒装的形式,把助动词,be动词,情态动词提之主语前.

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