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

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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