For a long time we        that going to university and getting a degree will ensure a financially stable future.[ ]

A. are told

B. have told

C. have been told

D. tell

右输尿管上段结石，直径1cm大小。排泄性尿路造影提示右肾轻度积水，经非手术治疗3个月，KUB复查结石下降1cm，患者无症状，应该如何处理（）

A.右肾盂造瘘

B.继续非手术治疗3个月后复查

C.中西医结合治疗

D.输尿管切开取石

E.口服抗生素，预防感染