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最好说明原因

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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最好说明原因
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
最好说明原因

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最好说明原因
C
open 作为动词是终止性动词,不能与FOR 等连用,故要改为be open