We are going to discuss the way of reading works ________ it is used for real life purposes, and this should give you a better understanding of it．
A.thatB.whichC.whereD.when在线课程D
解析：
句子结构reading works it is used for real life purposes作定语修饰前面的the way；根据reading works与it is used for real life purposes的逻辑关系，空后面句子为状语从句，从而排除选项A、B；根据句子的意思：我们将要讨论阅读在用作真实的生活目的时如何起作用的方法，从而可知正确答案为D项。