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3.---When____you_____the new bike?---I_____it for 2days.(  )
A.did,have,boughtB.did,buy,have had
C.did,buy,have bought   

分析 --你什么时候买的那辆新自行车?
--我买了两天了.

解答 答案:B.
 根据问句的题干"你什么时候买的那辆新自行车?"即提问过去的动作开始的时间,所以用一般过去时,这是一个特殊疑问句,应借助于助动词did.前面使用了助动词,后面的谓语动词要使用原形buy.答语中,句中的时间状语for+时段是现在完成时的标志,且句子中的谓语动词必须是延续性动词,现在完成时的构成是:主语+have/has+动词的过去分词; 动词buy是一个非延续性动词,转换成have之后才可以与时间段连用,表示动作延续了一段时间,故答案为B.

点评 本题考查了动词的时态.做题时,一定要特别关注有关的时间短语,这是判断句子时态的标志.在没有时间状语的情况下可以联系上下文根据语境来做出正确判断.

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