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

试题分析:句意:人们现在正在回收过去会扔掉的东西。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,和过去相反用would have done。所以选D。
【知识拓展】
所谓含蓄条件句就是利用语境不直接说出条件的句子。这种句子可以分为两类:一种是广义的含蓄条件句,另一种是狭义的含蓄条件句。1. 广义含蓄指的是不用连词 if 或 unless 介绍条件,而是改用其他方式。事实上这些表达方式也是同样是条件状语。(1)用介词引入条件: * but for(如不是, 如没有):注意,凡是出现这个复合介词的句子,必须要用虚拟语气, * without/with (在不具备/具备…的条件下), * under (在…条件下)(2)分词短语充当条件(分词短语本身就具有充当条件状语的功能),(3)表示不具备条件的连词连词:but,but that,or或otherwise,2. 狭义含蓄指的是不用任何语言方式显示条件,而是把条件隐藏在具体的原环境中,(1)用上下文暗示条件,(2)用委婉语气暗示条件,(3)用表示愿望的语气暗示条件。
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