男性，15岁，3周前发热、咽痛，1周来眼睑轻度水肿，一天前突然剧烈头痛，全身抽搐，意识不清，数分钟后意识清醒，自述头痛，既往无高血压史，BP170/110mmHg，血红蛋白120g/L，尿常规示蛋白（++），RBC20~30个/HP，颗粒管型2~3个/HP，尿比重1.025；BUN13.3mmol/L，眼底视 * * 轻度水肿，出现抽搐。

出现高血压的原发病是（）

A.急性肾小球肾炎

B.慢性肾炎急性发作

C.急性肾盂肾炎

D.急进性肾小球肾炎

E.肾结核

The large size and roughly circular shape of the Pacific made some scientists think that it ()a hole left when the moon separated from the earth.

A. used to be

B. would have been

C. might have been

D. should have been