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    精英家教网 > 高中英语 > 题目详情
    14．Since nobody gave him any help，hemust have finished（must finish） the research on his own completely．

    分析 由于没有人给予他任何帮助，他肯定是完全独立地完成这项研究．

    解答 答案是must have finished．本题考查表示推测的情态动词的用法．must表示推测时常见的三种结构：1）must be doing对正在进行的动作的推测； 2）must be 对现在的状态的推测；3）must have done对过去的或已经发生的事件的推测．由上文的动词过去式gave推断本题是对过去的事件的推测，故选用must have done 的结构，答案用must have finished．

    点评 本题表示推测的情态动词的用法．要在理解表示推测的情态动词的基本用法的基础上结合语境判断．

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