问题
选择题
____ 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
答案
答案：A
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____ 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
答案：A