Was it not until you began to work _______ how much time you had wasted? [ ]

A. that you realized

B. did you realize

C. did you not realize

D. that you didn't realize

Ⅱ型急进性肾炎为（）

A.补体持续降低

B.补体于6～8周恢复正常

C.补体降低可提示病变活动

D.血清补体可降低

E.血清补体正常