【When the plane is to take off has not been ann】

【When the plane is to take off has not been ann】

announce 是人为动作 所以主语为 When the plane is to take off 起飞时间 的时候 主语是被announce 所以是 be announced 时间是被人宣布的======以下答案可供参考======供参考答案1:has not been announced 现在完成时，have been done sth.，这边是被动语态供参考答案2:has not been announced -------是“被动语态”形式，解释为：还没有被通知。供参考答案3:这不是表示被动语态嘛！！！供参考答案4:首先分析句子成分，题中的句子是一个主语从句，主语是一个When the plan is to take off，我们把它替换成It，原句就变成It has not been announced，显然是一个现在完成时的否定句，现在完成时的语法楼主应当知道，所以在此就不用多说，for example, what you have asked hasn't bees solved now. 意思是您提的问题到现在还没解决。

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