they have to decide what to do about the energy crisis before the oil__ a.is run out b.runs out

题目

they have to decide what to do about the energy crisis before the oil__ a.is run out b.runs out
选哪个为什么请给出详细解释

答案

B,什么谓不谓语的,这道题考的是被动语态里的主动表被动,run out 用尽,耗光.主动表示被动含义.