白塞病所致肾损害（）

A.主要累及远端肾小管，表现为Ⅰ型肾小管酸中毒

B.有45％～83％的患者出现肾损害表现为蛋白尿、血尿、管型尿和高血压，一般无肾小球炎表现

C.78％的患者出现肾损害，特点为急性肾小球肾炎的表现可急剧恶化出现肾功能不全

D.肾损害较轻，多为一过性的，一般不影响肾功能，表现为血尿、蛋白尿

E.因小动脉内皮细胞增生导致肾缺血、肾功能受损表现为蛋白尿、镜下血尿、高血压、氮质血症，也可发生急性肾衰

Somebody rang my doorbell just now, but I didn't know _____. [ ]

A. who were they

B. who they were

C. who it was