— Did you know any Chinese, Joyce, before you arrived in Beijing?

— In fact, never _______ it.

A．have I learned

B．I have learned

C．had I learned

D．I had learned

泌尿外科引流管的护理包括（）

A.鼓励多饮水，每日达到2500ml

B.保持床单整洁干燥

C.保持各引流管通畅、无脱落、拆叠、扭曲

D.注意引流液的色、质、量

E.前列腺摘除术后，膀胱造口一般在术后24小时内拔除引流管