来自沈家庆的问题
【一个状语从句填空Anymeasureofanad'sperformanceisentirelypointlessitcouldbeviewedbyaperson.】
一个状语从句填空Anymeasureofanad'sperformanceisentirelypointlessitcouldbeviewedbyaperson.


【一个状语从句填空Anymeasureofanad'sperformanceisentirelypointlessitcouldbeviewedbyaperson.】
一个状语从句填空Anymeasureofanad'sperformanceisentirelypointlessitcouldbeviewedbyaperson.
答案:unless
其意思是:如果不,除非