If I hadn’t been lucky enough to meet you. I really _____ what I would have done.

A．don’t know

B．hadn’t known

C．wasn’t knowing

D．wouldn’t know

恶心呕吐伴腹泻1个月，有关节炎及肾绞痛史，尿比重1.015，尿蛋白（+），红细胞10~20个/HP，血BUN20mmol/L，血尿酸739mmol/L，血肌酐为560μmol/L，诊断是（）

A.肾结石并尿毒症

B.痛风肾肾功能不全

C.狼疮肾炎尿毒症

D.肾结核伴尿毒症

E.肾动脉硬化伴尿毒症