Libraries have reference books ______ you can check out a physician’s educationa

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问题 Libraries have reference books ______ you can check out a physician’s educational background, training, and other credentials.

选项 A、from that
B、of which
C、through that
D、by which

答案 D

解析句意：图书馆有参考书，你可以用它们参阅医生的教育背景、受过的训练和其他的证书。空格后面为定语从句，引导词若介词前提则必须使用which。表示“通过参考书参阅”一意时用介词by比of更好。故选D。

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Althoughhehadlookedthroughallthereferencematerialsonthesubject,hest