◎ 题干
The trip was hard at first. But it was smooth_____ . 
A.at the endB.in the endC.of the endD.by the end
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The trip was hard at first. But it was smooth_____ .A.at the endB.in the endC.of the endD.by the end…”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。