题目：
I’m told that languagepractising.com is a free website ____ learners can not only learn various languages but also chat online.
A．where
B．which
C．that
D．what
答案：
A
考查定语从句。where引导定语从句，where在从句中作状语，where="on" which。句意为：我听说languagepractising.com 是个免费的网站，在这个网站上学习者不仅能学习各种语言，而且还能网上聊天。
