A student at a Nevada middle school opened fire on campus, wounding two l2-year-old boys and a math teacher.
A. kill
B. killing
C. killed
D. to kill
网友回答
A. kill
(答案→)B. killing
C. killed
D. to kill
解析：句意：一个Nevada的中学的学生在校园开枪，伤了两个12岁的男孩和一名数学老师。这里用现在分词做伴随状语和wounding是并列的，所以选B。