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

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

试题答案

B    

解析：

此题考查了情态动词的用法。“must＋have＋过去分词”表示对过去发生事情的一种较为肯定的推测，而“should＋have＋过去分词”表示应该做到而实际上没有做到的事情。