题目内容
6.-When did you begin to do your homework?-Half an hour ago,but I it yet.( )| A. | didn't finish | B. | finished | ||
| C. | have finished | D. | haven't finished |
分析 ---你什么时候开始做作业了?
---半小时前,但是我还没有完成.
解答 答案:D.but表示转折,可知是说还没有完成,动作发生在过去,对现在造成一定的影响,故用现在完成时have/has+过去分词,故答案是D.
点评 现在完成时有两种用法1.过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作.2.表示过去发生的、持续到现在的动作或状态.
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