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

问题补充：

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

A. to

B. for

C. of

D. from

答案：

A. to

B. for

C. of

D. from

解析：of在此表示动宾关系，the study of the ancient Chinese characters再如：the use of solar energy，the discovery of America by Columbus等。故选C。