问题:
【题文】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
【题文】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 |
参考答案: