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

試題分析：句意：辦公室的燈滅了，他一定已經(jīng)離開回家了。從The light in his office is out.可知是對過去的肯定的推測，用must have done“過去一定做了”，should have done“過去本應該做而沒有做”，所以選A。