题目内容
16.--Why are the windows so dirty?--Because we_________them for a long time.( )
| A. | have cleaned | B. | haven't cleaned | C. | didn't clean |
分析 句意:为什么窗户这么脏?因为我们很长时间没有擦它们了.
解答 答案:B,现在完成时态表示过去发生的事情对现在造成的影响和结果.根据事情的结果Why are the windows so dirty?可知很长时间没有擦窗户了,故用现在完成时态的否定形式.haven't/hasn't+动词的过去分词 故选B
点评 现在完成时态一定要区别于一般过去时态,它强调的是事情的结果,一般过去时态只强调过去的动作
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