问题
选择题
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
题目分析：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。