问题补充：
You need some facts to base your theory.
A. where
B. on which
C. in place where
D. in the place
答案：
A. where
(答案→)B. on which
C. in place where
D. in the place
解析：本题考查 “prep. + which+不定式”放在名词后作定语这一知识点。由于这一结构不是定语从句所以prep. + which一定不能转换成where. base...on 意为“基于，作为……的基础”。
