If we see a blind person getting off a bus, we watch to make sure that he is in no danger of falling. Members of a family help one another, with particular care for the very young and the elderly.
A.如果见到一个盲人正在上公共汽车,我们就会留心,确保他不会有跌倒的危险。家庭成员之间会相互帮助,尤其是照顾幼童和老人。
B. 如果见到一个盲人正从公共汽车上下来,我们就会留心,确保他不会有跌倒的危险。家庭成员之间会相互帮助,尤其是照顾幼童和老人。