—What were you doing at 9 o'clock last Saturday morning?

—I ______in my bed. [ ]

A. am sleeping

B. was sleep

C. was sleeping

D. sleep

男性，11岁，咽痛、发热3周后出现水肿少尿，尿色发红，血压148／90mmHg，尿蛋白（+++），红细胞满视野，红细胞管型（++），血肌酐260μmol／L，血清补体C3降低

患者最有可能的诊断为（）

A.肾病综合征

B.急进性肾炎

C.IgA肾病

D.急性肾炎

E.慢性肾炎