问题补充：
单选题Withnoagreement___,theleadersinthesix-sidetalkswillspendanothertwohours,___inthehotel,___thenuclearproblemoftheNorthKorea.A.reaching; locking; discussingB.reaching; locking; having discussedC.reached; locked; discussingD.reached; locked; discussed
答案：
C
