The trend of Phubbing group (低头族) getting increasingly large is spreading worldwide, many problems such as traffic accidents and cold interpersonal relationship.
A. and cause
B. only to cause
C. caused
D. causing
网友回答
A. and cause
B. only to cause
C. caused
(答案→)D. causing
解析：句意：越来越多的低头族的趋势在全世界蔓延，导致很多问题，如：交通事故和人们之间冷淡的关系，这里是非谓语动词做结果状语，因为是顺理成章的结果，所以用现在分词做结果状语，A项应该是and caused， B项是不定式，应该做意料之外的结果，C是过去分词，这里是主动关系，所以不对，选D。