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Mr. Smith, together with his two sons,_____Shanghai for about five months.
A.has leftB.has been away fromC.have leftD.have been away from
B

试题分析:句意:史密斯先生,和他的两个儿子,已经离开上海大约五个月的时间了。结合语境可知本句描述的是已经持续了五个月的状态,故用现在完成时态。together with his two sons为伴随主语,真正主语是Mr. Smith,故助动词用单数,选AC表示瞬间动作,不能和表示一段时间的时间状语连用。故选B。
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。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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