Amy ____ the school library. She ______ books three times a week.

A．has gone to; has used to borrow

B．has been to; used to borrow

C．has gone to; has been used to borrowing

D．has been to; is used to borrowing

病例摘要：患者，男性，23岁，因无痛性便血1个月余入院。大便为鲜红色，无黑便、呕血，查体：心、肺、腹未见明显异常，入院前未行特殊处理。

患者应考虑哪些疾病（）

A.结肠癌

B.直肠癌

C.肛裂

D.肛瘘

E.肛窦