<正> 首先让我们看几道近几年的高考题: 1)There was plenty of time.She_.(87) A.mustn’t have hurried B.couldn’t have hurried C.must not hurry D.needn’t have hurried 2)The plant is dead.I_it more water.(87) A.will give B.would have given C.must give D.should have given 3)I didn’t hear the phone.I_asleep.(89) A.must be B.must have been C.should be D.should have been 它们的答案分别是1)D.2)D.3)B。为何选择这些答案,下面简单谈一下情态动词+动词完成式的含义和用法。一、can(could)+动词的完成式,常用于否定句或疑问句,表