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    --- He looks so tired. What’s wrong?

      --- Nothing serious. He just stayed up last night, ___________his papers.

      A. to prepare     B. having prepared      C. prepared     D. preparing

     

    【答案】

    D

    【解析】

    试题分析：整个句子已经有谓语动词，所以该空应该用非谓语动词，又因为He与prepare之间是主动关系或伴随状语，故排除C；选项A表目的或将来，但是前面不用加逗号，故排除A；选项B表示它的动作发生在谓语动词之前，显然是错误的，故排除A，所以选D

    考点：考查非谓语动词的用法

    点评：非谓语动词是高考热点也是考生比较难以理解的语法项目，故考生需要做一些这方面的试题来加以巩固。

    即学即练：_________attentively，he forgot the time for lunch．

    A. to Read      B. having read          C. Read     D. Reading

    解析：D Reading attentively与he之间是主动关系，Reading attentively作原因状语。句意：由于在专心读书，他忘了吃午饭的时间。

     

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