With an appropriate modal verb:
(1)He ____ have completed his work; otherwise, he wouldn't be enjoying himself by the seaside. (2)I've decided to take the job and I ____ change my mind
【正确答案】：must;wont
【题目解析】：【考点点击】本题考查情态动词。【要点透析】 must have done表示对过去的肯定推测,意为“肯定做过某事”,根据题干可知,句子所要表达的意思是“他肯定完成了工作,否则他不会在海边享乐”。won't是will的否定形式,表示对将来的否定,意为“将不会…”,符合题意。
