Question

He ____________ have completed his work, other wise, he wouldn't be enjoying him

He ____________ have completed his work, other wise, he wouldn't be enjoying himself by the seaside.
A. should
B. must
C. wouldn't
D. can't

Answer 1

答案B
据本句意思“他一定是已完成工作了；否则，他就不会在海边玩得那么高兴了。”可知是对过去发生的事情的肯定推测。故应选用must。