____ the end of last year, I have been working on the project, and it is progressing well.

A. Since
B. By
C. At
D. In
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科目：高中英語 來源：同步題 題型：單選題

____ the end of last year, I have been working on the project, and it is progressing well.
[     ]
A. Since
B. By
C. At
D. In

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