It is quite impossible that it will rain tomorrow. But if it __________, I would still go to school by bike.

A．should rain

B．would rain

C．rains

D．had rained

故障停电是指供电系统无论何种原因未能按规定程序向调度提出申请，未在（）（或按供电合同要求的时间）前得到批准并通知主要用户的停电。