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 |
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 |
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