问题
选择题
The new lecture course differs from the old one, ________ the students aren't required to attend lectures.
A．which that
B．that
C．which
D．in which
答案
答案：D
根据句意可知，逗号后为定语从句，先行词为the old one，由于定语从句不缺少主要成分，当先行词还原时只能作状语，此时只能选择“介词+which”或“where”作连接词，由此可知答案为D