成煤过程经过了（）阶段
A、泥炭化阶段、煤化阶段
B、隔绝空气阶段、地壳运动阶段
C、褐煤阶段、烟煤阶段、无烟煤阶段
参考答案：A
—Did you watch the movie Mei Lanfang in the People’s Theatre last night?
— I had planned to, but it ________ hard all the time.
A．is raining
B．was raining
C．has rained
D．had rained
资金时间价值是资金周转使用中由于时间因素而形成的( )。
A．资金量B．后期价值C．前期价值D．差额价值
— I had planned to, but it ________ hard all the time.