Question

【题目】As a kind of important energy, coal(煤炭) can _______ one day.
A.keep out
B.run out
C.be run out
D.run out of

Answer 1

【答案】B
【解析】短语run out意为“用完，耗尽(主语是物)”，keep out“阻止……进入”， run out of “用完……东西(主语是人)”；选项C是被动形式，其后应加介词of，故选B。