【题目】Bejing Daxing International Airport completed its first flight of passenger planes ___________four aircrafts landed safely on the runway Monday morning.
A.thoughB.asC.whileD.before
在线课程【答案】B
【解析】
考查时间状语从句。句意：周一上午，北京大兴国际机场四架飞机安全降落在跑道上，完成了首架客机的飞行。此处是as“随着”引导的时间状语从句，故选B。