【题目】To my delight, the students are recycling many things they _______ away in the past.
A.were throwingB.will be throwingC.would have thrownD.had thrown
在线课程【答案】C
【解析】
考查虚拟语气。句意：让我高兴的是，学生们正在回收很多东西，是他们过去本来会扔掉的。分析句子可知，空格所在句定语从句，是一个隐含的虚拟语气，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。故选C。