Question

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

Answer 1

A

试题分析：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。