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        1. The Dongying-Hainan airline         for about 5 months. I have taken the flights three times. 

          A.is open B.has opened C.has been open D.has been opened

          C

          解析試題分析:句意:東營海南航空公司已經(jīng)開通大約5個(gè)月了,我已經(jīng)乘坐過3次了。完成時(shí)for加一段時(shí)間要求謂語動(dòng)詞是持續(xù)或表示狀態(tài)的,結(jié)合語境故選C。
          考點(diǎn):考查動(dòng)詞時(shí)態(tài)。

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