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Has it been announced the planes are to take off? A. when B. if C. which D. what

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Has it been announced the planes are to take off? A. when B. if C. which D. what

Has it been announced ________ the planes are to take off?

A. when

B. if

C. which

D. what

 

试题答案

答案：A

解析：
前面的it是形式主语，when引导主语从句。

 

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标签：theplanesareannouncedhas

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