问题
选择题
I often watch CCTV-9, ________ I have learned a lot of new words and expressions.
A．from which
B．of which
C．to which
D．which
答案
A
考查非限制性定语从句。“从......学到......”learn sth. from ...；“我经常看中央9频道，我已经从中央9套学到了很多新词和短语。”根据介词from排除B、C、D。故选A。