【题目】He realized that someone __________ his room. Something important was missing.
A. shouldn’t have enteredB. could have entered
C. can’t have enteredD. must have entered
在线课程【答案】D
【解析】
考查情态动词+have done。句意：他意识到一定有人进过他的房间。某个重要的东西丢了。must have done意为“肯定做过某事”，是对过去事情的肯定推测。分析句意可知， must have entered符合句意。故D选项正确。