7. Research findings show we spend about two hours dreaming every night, 　no matter what we _____ during the day.
A. should have done
B. would have done
C. may have done
D. must have done

8. The boy spent as much time watching TV as he _____ studying.
A. does
B. had
C. was
D. did


答案：
7. C
译文：研究结果表明：我们每天晚上有两个小时在做梦，不管我们白天做了什么。
本句是情态动词的用法。“may+have+过去分词”的肯定形式表示对过去发生的情况进行推测。