题目内容
20．---Why are you in such a hurry，Sue？---I'm A Singer Final _____ for 5minutes．（ ）| A． | will start | B． | will be on | C． | has started | D． | has been on |
分析 --苏，为什么你这么匆忙？
--《我是歌手》决赛开始有五分钟了．
解答 答案：D；现在完成时可以用来表示发生在过去某一时刻的，持续到现在的动作（用行为动词表示）或状态（be动词表示）常与for（+时间段），since（+时间点或过去时的句子）连用．根据I'm A Singer Final _____ for 5minutes可知用现在完成时，现在完成时中，非延续性动词不能与for和since引导的表示一段时间的状语连用，通常是用相应的延续性动词来代替．start对应的延续性状态词是 be on．根据其构成has/have+过去分词．故选D．
点评 根据句中信息推测出该句的句意是解答此题的关键；还要对给出的答案进行分析和比较，从而作出正确解答．
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