题干
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
答案(点此获取答案解析）
B
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
