题目内容
13．______all the homework assigned by the school the students have to work at it till midnight（ ）| A． | Completing | B． | To complete | ||
| C． | Having completed | D． | To have completed |
分析 要完成学校布置的作业，学生们要做到半夜了．
解答 答案：B 本题考查动词不等式作目的状语的用法．题干中complete的动作还未发生，要用动词不等式来表示目的；D项是不等式的完成式，表示在谓语动词之前已经完成的动作，不符合题意．故选B．
点评 动词不等式是非谓语动词的一种，也是英语中比较活跃的一类结构．通常用来作主语，宾语，表语，定语，状语等．学习时要全面掌握，熟练运用．
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