The Dongying-Hainan airline for about 5 months. I have taken the flights three times. A. is openB. h...
2023-02-05 20:20:37 61次 2014年山东省肥城市毕业升学模拟考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The Dongying-Hainan airline for about 5 months. I have taken the flights three times.
A. is openB. has openedC. has been openD. has been opened
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