The President of Harvard pioneered the elective system by ______ students were able to choose their own courses of study.

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问题 The President of Harvard pioneered the elective system by ______ students were able to choose their own courses of study.

选项 A、what
B、whom
C、that
D、which

答案D

解析 本题考查的是定语从句的用法。通过分析可知,本句中从句的先行词是the elective system,是物而非人,故应从C和D两项中选择,又因从句中的介词提到了引导词的前面,故选项D为正确答案。A项“what”不引导定语从句;B项“whom”指代人,不能与表物的先行词搭配;C项“that”可引导定语从句,但不能与介词连用,故均可排除。
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