He will come to understand your efforts sooner or later. It’s just a ________of time.

A．criterion

B．patent

C．variety

D．matter

输尿管结石者（）

A、疼痛向右肩部放射 

B、疼痛向背部放射 

C、疼痛向左肩放射 

D、疼痛向上腹放射 

E、疼痛向会阴部放射