The light in his office is out. He left for home.A. must haveB. must have beenC. should ha

问题补充：

The light in his office is out. He left for home.

A. must have

B. must have been

C. should have

D. should have been

答案：

(答案→)A. must have

B. must have been

C. should have

D. should have been

解析：句意：办公室的灯灭了，他一定已经离开回家了。从The light in his office is out.可知是对过去的肯定的推测，用must have done“过去一定做了”，should have done“过去本应该做而没有做”，所以选A。