Technology has quickened the rate we municate with the world around us.
A. for which
B. at which
C. to which
D. with which
网友回答
A. for which
(答案→)B. at which
C. to which
D. with which
解析：句意：技术加快了速度，我们以这种速度与我们周围的世人进行交流。这里是定语从句，先行词是rate，以rate连用的是介词at，which在从句中作介词的宾语，故选B。