.

He chose to teach in a western province, though he _______in the city for a better life.

A．could stay

B．would stay

C．could have stayed

D．had stayed

关于外科营养，恰当的是

A．营养状态差的病人首先考虑肠内营养

B．肠外营养的完善使其可以替代肠内营养

C．肠外营养较肠内营养安全、并发症少

D．肠瘘的患者应首选肠内营养

E．肠外营养可使消化道处于休息状态，可保护胃肠道的结构和功能