单选题 WeChat has seen monthly active users grow to 468 million worldwide since its 2011 introduction , Chinese students who adopted WeChat while in their home country are now set to be the foundation of the app"s US push.
【正确答案】 B
【答案解析】解析：分析题干可知，题干中用逗号连接了两个相互独立的完整的句子，因此本句犯了“逗号叠加”的语法错误。因此本题应选B项。