The number of people invited _____ fifty, but a number of them _____ absent for different reasons. [ ]

A. were; was

B. was; was

C. was; were

D. were; were

25岁，女性。突然水肿尿少、血尿。3周后，进入昏迷，尿蛋白（+++）。RBC10-15个/HP。WBC1-3个/HP，颗粒管型0-3个/HP，BP180/110mmHg，BUN27mmol/L，急诊入院。

经治疗病人意识清楚，但BUN进一步升高，血Cr达到1030umol/L，进一步治疗应采取最有效的措施是（）

A.静点必需氨基酸

B.加大速尿用量

C.改善肾血流

D.扩血管药物应用

E.透析治疗