问题
选择题
Technology has quickened the rate _________ we communicate with the world around us.
A．for which
B．at which
C．to which
D．with which
答案
B
题目分析：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。
考点：