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    All passengers are expected to fasten the seatbelts when the plane 闂傚倸鍊搁崐鎼佸磹閻戣姤鍤勯柛顐ｆ礀绾惧鏌曟繛鐐珔缁炬儳鐏濋埞鎴︽偐瀹曞浂鏆￠梺鎼炲€曢悧蹇涘箟閹间焦鍋嬮柛顐ｇ箘閻熴劑姊虹紒妯虹瑨闁诲繑宀告俊鐢稿礋椤栨氨顔婇梺瑙勬儗閸ㄩ亶寮ィ鍐╃厽閹兼番鍨婚崯鏌ユ煙閸戙倖瀚�【查看更多】

     

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    All passengers        are expected to fasten the seatbelts when the plane takes off and lands.

    A. on the board   B. on board      C. on a board    D. on boards

     

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    All passengers        are expected to fasten the seatbelts when the plane takes off and lands.

    A. on the board      B. on board    C. on a board  D. on boards

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    All passengers 　　   are expected to fasten the seatbelts when the plane takes off and lands.

    A. on the board　　　　　　 B.on board?　　    C.on a board　　　　  D.on boards

     

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    All passengers 　　   are expected to fasten the seatbelts when the plane takes off and lands.

    A. on the board　　　　　　 B.on board?　　    C.on a board　　　　  D.on boards

     

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