男性，32岁。右肾绞痛后尿闭1天，腹部平片可见双侧输尿管中段各有结石一枚，约1cm大小，左肾内还有鹿角形结石，急诊处理应先采用（）

A.服中药排石

B.中西医结合解痉排石

C.膀胱镜下输尿管插管缓解肾功能引流尿液

D.利尿药物应用

E.立即手术输尿管切开取石

—Excuse me. Could you tell me____ later on?

—Wait a minute. It’s coming in ten minutes.[ ]

A. if the next train arrives.

B. if the next train will arrive

C. when the next train arrives

D. when will the next train arrive