Today computers ______in both cities and towns A. were using B. are used C were used D are using
选B
首先确定用被动语态,因为电脑时被使用的
其次是复数,因为主语是【computers】
被动结构是【be+过去分词】
最后因为时间状语是【today】所以用一般现在时
有不会的可以再问我