The Dongying-Hainan airline         for about 5 months. I have taken the flights three times.
A．is openB．has opened C．has been openD．has been opened
C
句意：東營(yíng)——海南航線(xiàn)已經(jīng)開(kāi)通了五個(gè)月了。我已經(jīng)乘坐過(guò)這個(gè)航班三次了。結(jié)合語(yǔ)境可知本句描述的是現(xiàn)在已經(jīng)完成的動(dòng)作，用現(xiàn)在完成時(shí)態(tài)。主語(yǔ)是動(dòng)作對(duì)象，故用被動(dòng)語(yǔ)態(tài)。選Ｃ。
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