After three hours' discussion the meeting finally without any agreement on the issue.A.

问题补充：

After three hours discussion, the meeting finally without any agreement on the issue.

A. broke out

B. broke down

C. broke away

D. broke through

答案：

A. broke out

(答案→)B. broke down

C. broke away

D. broke through

解析：B 考察动词短语。句义：三个小时的讨论以后，会谈失败，没有能够达成任何共识。Break down谈判失败；break out爆发；break away挣脱，脱离。Break through突破。