问题补充:
Without facts,we can’t form a correct opinion,for we need to have actual knowledgeour thinking.
A. which to be based on
B. which to base on
C. on which to base
D. which to base
答案:
A. which to be based on
B. which to base on
(答案→)C. on which to base
D. which to base
解析:base A on B把A建立在B的基础上。