病历摘要：患者男78岁，肠梗阻手术后，因多器官功能衰竭，被送入ICU

防止急性肾功能衰退时的高钾血症，下列哪些措施有预防作用（）。

A.彻底清创，预防感染

B.供应足够能量

C.适当使用蛋白质合成激素

D.禁含钾食物

E.如有贫血，可输库存血

--Could you tell us __________ ?

--About two weeks.

A．how often are we going to be away

B．how often we are going to be away

C．how long are we going to be away

D．how long we are going to be away