How I wish it____! If it ___in a couple of days, the crops would survive.  

A．will rain; rained

B．would rain; should rain

C．should rain; rains

D．would rain; had rained

《煤矿安全规程》规定，直线段和加宽后的曲线段，轨距上偏差为（），下偏差为（）。（）

A.+5mm

B.+7mm

C.-2mm

D.-4mm