【题目】---- Where is my reference book? It was here a moment ago.
---- Someone ______it by mistake
A. could have taken B. must take
C. may take D. must have taken
在线课程【答案】D
【解析】
考查情态动词+have done。句意：---我的参考书呢？刚才还在这里。---一定是有人拿错了。由“It was here a moment ago”可知，表示的是对过去事实肯定的推测，所以用must have taken。故D选项正确。