After discussing, the students came up with some good ideas to work on the project-

--- After discussing, the students came up with some good ideas to work on the project .
--- That’s great!
A. at the end
B. in the end
C. by the end
D. to the end

A. at the end(答案→)B. in the endC. by the endD. to the end解析：考查情景交际和固定短语。“经过讨论，学生们想出了一些好的主意来制定那个计划。”“太棒了！”at the end需和of连用，意为“在......的末尾/尽头”；in the end“最后”，单独使用；by the end of...“到......末尾”；to the end“到底”。故选B。

我明天再问问老师，叫他解释下这个问题