The findings of the research on a lot of experiments are convincing.A. to baseB. basedC

问题补充：

The findings of the research, on a lot of experiments, are convincing.

A. to base

B. based

C. is based

D. basing

答案：

A. to base

(答案→)B. based

C. is based

D. basing

解析： 考查过去分词作定语，短语：be based on 以什么为基础，based on做定语在这里相当于which are based on,句意：这些一许多实验为基础的研究结果令人信服。故选B。