题目内容
15.-Lisa,why are you still here?School is over.-I ______ my classroom yet,I need fifteen more minutes.( )
| A. | don't clean | B. | haven't cleaned | C. | didn't clean | D. | won't clean |
分析 -丽萨,你为什么仍在这儿?已经放学了.
-我还没有打扫教室,我需要15分钟.
解答 答案:B 根据yet可知,已经或完成的动作对现在造成一定的影响,所以用现在完成时态,现在完成时态的结构为have/has+动词的过去分词,主语是I,所以助动词用have,否定式结构为:haven't,故选B.
点评 本题主要考查现在完成时,用法:表示过去发生或完成的动作对现在造成的影响或结果,还表示过去发生动作一直持续到现在.其结构是have/has+及物动词的过去分词.
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