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Lily with her parents ______ Oxfam since two years ago.
A.has joinedB.have joinedC.has been inD.have been in

试题分析:句意:莉莉和她的父母在两年前就已经加入了施乐会。结合语境可知本句描述的是已经持续了两年的动作,故用现在完成时态。with her parents是伴随主语,真正主语是莉莉,故助动词用单数。瞬间动词不能和持续性时间状语连用,选项AC,表示瞬间动作,故选C。
点评:英语中的时态主要是借助于时间状语与上下文语境来进行判断。解答此类题型,首先要注意句子中的时间状语,如果没有则要通过分析上下文,结合语境来判断句子的时态。英语中的现在进行时态和现在完成时态中的助动词,往往因为主语的不同,而有所不同,需要注意与主语保持一致。完成时态中的动词有瞬间动词和持续性动词之分,瞬间动词的过去分词强调的是动作的完成,持续性动词强调的是动作的持续性。现在完成时态中表示一段时间的时间状语不能和瞬间动词连用,持续性动词不能和表示瞬间时间的时间状语连用,需注意区分。
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