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    --- Do you know the reason pilots turn off the plane’s lights before taking off? ---The practice is for the passengers to adjust to the dark an emergency. A. why; for fear that B. for which; in case of C. how; for fear of D. that; in case 【查看更多】

     

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    --- Do you know the reason _________ pilots turn off the plane’s lights before taking off?

    ---The practice is for the passengers to adjust to the dark _________ an emergency.

    A．why; for fear that

    B．for which; in case of

    C．how; for fear of

    D．that; in case

     

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    — Do you know the reason ________ pilots turn off the plane's lights before taking off?
    — The practice is for the passengers to adjust to the dark ________ an emergency.
    [     ]
    A. why;  for fear that    
    B. for which;  in case of       
    C. how;  for fear of        
    D. that;  in case 

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    --- Do you know the reason _________ pilots turn off the plane’s lights before taking off?

       ---The practice is for the passengers to adjust to the dark _________ an emergency.

    A. why; for fear that                    B. for which; in case of          

    C. how; for fear of                      D. that; in case

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    --- Do you know the reason _________ pilots turn off the plane’s lights before taking off?

    ---The practice is for the passengers to adjust to the dark _________ an emergency.

    A．why; for fear that                  B．for which; in case of

    C．how; for fear of                   D．that; in case

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    --- Do you know the reason _________ pilots turn off the plane’s lights before taking off?
    ---The practice is for the passengers to adjust to the dark _________ an emergency.

    A．why; for fear that B．for which; in case of
    C．how; for fear ofD．that; in case

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