问题
选择题
Without facts, we can’t form a correct opinion, for we need to have actual knowledge _______ our thinking.
A．which to be based on
B．which to base on
C．on which to base
D．which to base
答案
答案：C
“没有事实根据，我们不能形成一个正确的观点，因为我们需要以事实为基础进行思考。”knowledge是先行词，后面的定语从句缺少宾语，指物用which或that，介词后只能用which。故选C。