题目

 He was told that it would be at least three more months _____ he could recover and return to work.        A. when           B. before       C. since             D. that 答案：B从鞍山分别运4000吨钢材和10千克黄金至西安，最适宜的运输方式分别是： A．铁路和公路运输B．公路和航空运输 C．水运和航空运输D．铁路和航空运输