油气田的形成要素包括()。
A、生油层
B、储集层和改成
C、圈闭
D、上述三项
参考答案:D
I just couldn't understand the former mayor _____ the money raised for children in poor areas.
A.taking
B.to take
C.being taken
D.to be taken
怎样制定生产考核办法?