【題目】The president of Harvard pioneered the elective system______ students were able to choose their own courses of study.

A.on whichB.about whichC.to whichD.by which

【答案】D

【解析】

考查定語從句。句意：哈佛大學的校長率先推出了選修課，學生可以選擇自己的課程。此處為“介詞+關系代詞”結(jié)構(gòu)定語從句修飾先行詞system，且根據(jù)此處表示“學生可以借助系統(tǒng)選擇自己的課程”，表示“借助”應用介詞by，做介詞的賓語且指“系統(tǒng)”應用關系代詞which。故選D。

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