The world is runing _oil and we have to find alternative sources of energy. A out of B out
问题描述：
The world is runing _oil and we have to find alternative sources of energy. A out of B out
答
A
run out of 表示将...用光,用完,耗尽.后面接用光的物的名词,主语则是人或地区
run out 一般以物做主语,表示该物已用光,以主动形式表示被动意义