. 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
C
考查情態(tài)動(dòng)詞。句意“研究結(jié)果顯示，我們每晚要花兩個(gè)小時(shí)的時(shí)間做夢，無論白天做了什么事情�！眘hould have done“本應(yīng)該做某事”；would have done用于對過去事實(shí)的虛擬；may have done“可能已經(jīng)做了某事”；must have done“一定已經(jīng)做了某事”。這里表示“可能”。故選C。
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