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The undercover investigation on Britain's biggest crew operator P&O Cruises aimed to find out how clean the air holidaymakers breathe when on a ship is.
breathe when on a ship is
when和on同时出现是什么用法?


IP属地:福建1楼2017-07-14 10:43回复
    是when they are on the ship的省略形式


    来自Android客户端2楼2017-07-14 11:33
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