2. 外语
  3. ______(飞机什么时候起飞)has not been announced.

______(飞机什么时候起飞)has not been announced.

admin2013-08-22  36
问题 ______(飞机什么时候起飞)has not been announced.
选项
答案When the plane is to take off
解析
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大学英语四级

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