— You must have seen the great waterfall there.

— Sure. It is really a wonder, _____ that still seems right in front of me. [ ]

A. one

B. it

C. that

D. which

患者女，55岁。体重76kg，身高160cm。因多饮、多尿确诊为2型糖尿病，经饮食治疗和运动锻炼，2个月后空腹血糖为8.8mmol/L，餐后2小时血糖13mmol/L。进一步治疗应选择（）

A.加磺脲类降血糖药物

B.加双胍类降血糖药物

C.加胰岛素治疗

D.加口服降血糖药和胰岛素

E.维持原饮食治疗和运动