练习册

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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 解析:on board是固定短语.意为“在船上.上船 . 答案:B 【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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