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

     

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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

     

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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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