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個月了，我已經(jīng)乘坐過3次了。完成時for加一段時間要求謂語動詞是持續(xù)或表示狀態(tài)的，結(jié)合語境故選C。
考點：考查動詞時態(tài)。

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