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
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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。