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——海南航線已經(jīng)開通了五個月了。我已經(jīng)乘坐過這個航班三次了。結(jié)合語境可知本句描述的是現(xiàn)在已經(jīng)完成的動作，用現(xiàn)在完成時態(tài)。主語是動作對象，故用被動語態(tài)。選Ｃ。
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