The science of medicine _______ progress has been rapid lately is perhaps the most important of all the science.?
A．which?
B．in which?
C．that?
D．with which?
B?
“介詞+關(guān)系代詞” 引出其后的定語(yǔ)從句，which指先行詞the science of medicine,in which即in the science of medicine。
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