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 句意為：人們正在回收利用他們過去常常會扔掉的東西．

解答 答案：D 
這句話的which引導(dǎo)的是定語從句，是一個隱含的虛擬語氣，因?yàn)閕n the past相當(dāng)于If they had been in the past，所以句子用虛擬語氣，和過去相反主句用would have done．所以選D．

點(diǎn)評 要能看出句中有虛擬語氣（含蓄的），如果過去事實(shí)相反，條件句中使用過去完成時，主句使用"情態(tài)動詞+have done"；如果主句與現(xiàn)在事實(shí)相反，條件句中使用過去時，be動詞使用were，主句中使用"情態(tài)動詞+動詞原形"；如果與將來事實(shí)相反，條件句中有三種：過去時；were to do；should+動詞原形，主句使用"情態(tài)動詞+動詞原形"；要特別注意如果省略了if，句子要使用部分倒裝的形式，把助動詞，be動詞，情態(tài)動詞提之主語前．

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