--- What would you do if it ______tomorrow?

--- We have to carry it on, since we’ve got everything ready.

A．rains

B．rain

C．will rain

D．is raining

男，38岁，诊断高血压5年，口服降压药物血压控制不理想，经常有四肢无力，多尿，入院后查血钾2.8mmol/L，应首先想到下列那种疾病（）

A.嗜铬细胞瘤

B.皮质醇增多症

C.肾动脉狭窄性高血压

D.原发性醛固酮增多症

E.原发性高血压伴肾小管病变