After we talked about it for a long time he agreed to help us .A. at an endB. in the endC

问题补充：

After we talked about it for a long time, he agreed to help us .

A. at an end

B. in the end

C. as usual

D. at present

答案：

A. at an end

(答案→)B. in the end

C. as usual

D. at present

解析：短语辨析。A结束；B最后，终于；C和平时一样；D目前；现在；句意：在未命名谈论了很长一段时间以后，他终于同意帮助我们了。根据句意说明B正确。