1．Bejing Daxing International Airport completed its first flight of passenger planes ___________four aircrafts landed safely on the runway Monday morning.
A．though B．as C．while D．before
【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。
2．She was on the point of going out _________ the telephone rang.
A．while B．when C．as D．the moment
【答案】B
【解析】考查时间状语从句。句意：他正准备出门的时候，突然电话响了。本句为结构be about to do sth when正要做某事的时候，突然，强调另一个动作的突然性，故选B。
3．She was on the point of going out________ the telephone rang.
