题目

要运送32吨货物。怎样安排车辆最省钱? 答案：解：5辆大车，1辆小车，总计：300×5+240=1740（元）；4辆大车，2辆小车，总计：300×4+240×2=1680（元）答：安排4辆大货车，2辆小货车最省钱。Martin Smith who, at 22, is one of the male nannies(保姆) admits that it will be some time ____ male nannies are totally accepted.A．sinceB．untilC．beforeD．after