The trip was hard at first. But it was smooth .A. at the endB. in the endC. of the endD. b

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A. at the end
(答案→)B. in the end
C. of the end
D. by the end
解析：短语辨析。A. 最终；在终点   B. 终于；最后 C. 结束   D. 到……为止。句意：路程开始很艰难，但是最后顺利了。选项A强调在一个点，故选B。