The Dongying-Hainan airline__for about 5 months.A.has been o

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The Dongying-Hainan airline__for about 5 months.A.has been open B.has been opend选哪个,为什么?

答案：A.has been open
这里必须将open理解为形容词,而不能理解为动词,不能用opened,
因为open这个动词没有持续性,是属于时点的动词,不能用现在完成时态,
只能理解为形容词：开放的.
再问：可是题中都用been了，不就是一个状态性质了吗
再答：这里的be为系动词，has been为系动词be的现在完成时态，系动词后面跟形容词，一点问题都没有哇。就是表示存在的状态的。
再问：可是这里就不能理解成open的被动语态吗？
再答：不能将open理解为被动语态，因为如果这样理解的话，就说明这里的open为动词，但是，整个句子为现在完成时态，open为不可持续动作，不能有完成时态，所以，这里只能将open看成形容词。这下你明白了吗？
再问：那是不是任何不可延续性的动词都不能用在完成时中呢？那么 I has gone to Bejing for two days.这句话是不是不对？
再答：你说对了，只要是瞬间动词，不具有延续性的动词，都不能用在现在完成时态中。瞬间动词就是不能持续的动词，例如：become、eturn、die、say、reach、 go、come、tell、type、close、 leave、 buy、join、get to(know)、see、hear、 hear from 等。因此，你上面给出的例子“I has gone to Bejing for two days.“这句话是不对的，可以改正为： I has been to Bejing for two days. 明白了吗？

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