Once fighting between the two villages and many people were killed.
A. broke out
B. was broken out
C. had broken out
D. had been broken out
网友回答
(答案→)A. broke out
B. was broken out
C. had broken out
D. had been broken out
解析：考查时态.once 副词,曾经地意思.根据时间副词可知句子叙述的是过去发生的事情,故用过去时态.故选A.两个村子曾经爆发过冲突,许多人被杀了.