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—________did your uncle leave his hometown?
—He ________ for nearly twenty years.
A.When; has leftB.When; has been away
C.How long; has leftD.How long; has been away
B

试题分析:when什么时候;how long多长;根据下文时间状语,将近二十年了。可知上文提问的是时间长短,下文描述的是从过去某时持续到现在的状态,故谓语动词用持续性动词,故选B。
点评: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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