下列哪种疾病与结肠癌无关
A．溃疡型结肠炎
B．结肠腺瘤
C．家族性息肉病
D．增生型肠结核
E．结肠血吸虫性肉芽肿
参考答案：D
_____ on the subject for half an hour, Liu Ying suddenly stopped. [ ]
A. To be worked
B. To work
C. Having worked
D. Having been worked
长方体的6个面中，最多只能有4个面是正方形．______．
