_____ the expense， I _____ to Italy.

A．If it were not， go

B．Were it not for， would go

C．Weren't it for， will go

D．If it hadn't been， would have gone

女性，70岁，因幽门梗阻行胃大部切除术，术后嗜睡，皮肤苍白，血清钠为125mmol/L，血清钾3.5mmol/L，血红蛋白100g/L，血细胞比容25%。

此患者存在的水、电解质平衡紊乱是（）

A．水中毒 

B．高渗性缺水 

C．等渗性缺水 

D．高钾血症 

E．低钾血症