In the end we worked out the problem. A. At last B. Above all C. At a time

问题补充：

In the end, we worked out the problem.

A. At last B. Above all C. At a time

答案：

解析：本题考查短语。in the end 表示最后，相当于at last或finally，故选A。句意：最终，我们解出这个问题。