Copernicus’s theory is now the basis all our ideas of the universe are built.
A. to which
B. on which
C. for which
D. by which
网友回答
A. to which
(答案→)B. on which
C. for which
D. by which
解析：考察定语从句中介词的选择。本题考察的是定语从句中介词的使用，第一从句中介词的来源有三种：第一：定语从句中的固定搭配；第二：先行词的固定搭配；第三：根据定语从句的意思。本题basis（基础）与介词on连用。句意：哥白尼的理论是我们现在关于宇宙的理论的构建基础。