Question

He _______ have completed his work；otherwise, he wouldn’t be enjoying himself by the seaside.

A．should	B．must?
C．wouldn’t	D．can’t?

Answer 1

B?

此题考查情态动词must表推测的用法。must have done表示“对过去情况肯定的推测”，意为“一定发生了某事”。句意为“他一定完成了他的工作，否则他现在就不会在海边开心的玩了”。