[单项选择]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
参考答案:C 答案解析:[解析] C项may have done(可能做了什么)，其他几项用法，意义或语气都不对。
A. devote B. engage C. pursue D. register 参考答案:C 答案解析:此题考查动词词义。A项devote意为“将……献给”，后面常接to，与题干中的介词in不符。B项engage意为“占用；吸引”，其用法为(sth．)engage sb．或(sb．)be engaged
