The science of medicine progress has been very rapid lately is perhaps the most import

问题补充：

The science of medicine, progress has been very rapid lately, is perhaps the most important of all the sciences.

A. to which

B. in which

C. Which

D. with which

答案：

A. to which

(答案→)B. in which

C. Which

D. with which

解析：考查介词在定语从句的用法。先行词the science of medicine在定语从句中作状语。