尿频、尿急，尿白细胞数增多，细菌学检查阳性（）
A.急性肾小球肾炎
B.肾病综合征
C.急性肾衰竭
D.肾盂肾炎
E.肾良性囊肿
参考答案：D
从某厂生产的10 002辆电动自行车中随机抽取100辆测试某项性能，请合理选择抽样方法进行抽样，并写出抽样过程.
Not until I began to work _____ how much time I had wasted [ ]
A. didn't I realize
B. I didn't realize
C. did I realize
D. I realized
