Some people waste too much water .They don't believe that it can ____ some day .

问题描述:

Some people waste too much water .They don't believe that it can ____ some day .
A.be run out B.run out
两个都有被用完的意思,为什么选B不选A?请详解,

run out 没有被动语态,它是主动形式表示被动含义.