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. Research findings show we spend about two hours dreaming every night, no matter what we ____ have done during the day. 
A.shouldB.would C.mayD.must

答案
C
解析
考查情态动词。句意“研究结果显示,我们每晚要花两个小时的时间做梦,无论白天做了什么事情。”should have done“本应该做某事”;would have done用于对过去事实的虚拟;may have done“可能已经做了某事”;must have done“一定已经做了某事”。这里表示“可能”。故选C。
核心考点
试题【. Research findings show we spend about two hours dreaming every night, no matte】;主要考察你对虚拟语气等知识点的理解。[详细]
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