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You are silly not       your door.

A.to lock            B.to have locked      C.locking           D.having locked

 

【答案】

B

【解析】

试题分析:考查不定式用法。在本句中不定式做原因状语,句意:你没有锁门真是太愚蠢了。根据句意说明没有锁门是已经发生的事情,故使用不定式的完成式来表示已经完成已经发生的事情。不定式的一般式只表示与谓语动词同时发生或者稍后发生的事情。根据句意说明B正确。

考点:考查不定式用法

点评:在解题时一定要分清不定式的动作与谓语动词的动作的先后关系。不定式的完成式表示的是在谓语动词之前就已经发生的动作;一般式表示的是和谓语动词同时发生或者稍后发生的事情。

 

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