【题目】 a great many people like the convenience of using WeChat to communicate with each other, too many junk messages on it may make them bored.
A. While B. When C. As D. Since
在线课程【答案】A
【解析】考查连词。while虽然，尽管；when当…时候；as在…期间，当…时候；since既然；因为。句意：尽管许多人喜欢使用微信沟通带来的便利，但太多的垃圾信息也使他们感到很烦人。前后句是让步关系，故选A项。