The study you have been making ________ the ancient Chinese characters is an instructive job.

A. to      B. for

C. of       D. from

  C


解析:

因?yàn)閙ake a study of是習(xí)語，意為“仔細(xì)研究”，句中you have been…characters是一個(gè)省略了關(guān)系代詞的定語從句。

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