When I approached to the subway entrance, an explosion occurred. This my first experience, I got into panic
A. was
B. is
C. being
D. been
网友回答
A. was
B. is
(答案→)C. being
D. been
解析：考查非谓语。句意“当我走近地铁入口处时，爆炸发生了。因为这是我的第一次经历（爆炸），我变得惊慌失措。”第二句的前半句是分词短语作状语，表示原因，后半句是主句，故选C。