一到英语选择The black box is a necessary device on an airplane,which records its speed,direction and whether everything on the plane ____ normally.A.will function B.are functionedC.is functioning D.has functioned
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![一到英语选择The black box is a necessary device on an airplane,which records its speed,direction and whether everything on the plane ____ normally.A.will function B.are functionedC.is functioning D.has functioned](/uploads/image/z/6311131-43-1.jpg?t=%E4%B8%80%E5%88%B0%E8%8B%B1%E8%AF%AD%E9%80%89%E6%8B%A9The+black+box+is+a+necessary+device+on+an+airplane%2Cwhich+records+its+speed%2Cdirection+and+whether+everything+on+the+plane+____+normally.A.will+function+B.are+functionedC.is+functioning+D.has+functioned)
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