◎ 题干
The best times to visit Shangri-la are spring and autumn ___ the temperature is at its mildest.
A.where B.on which
C.when D.in that
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“The best times to visit Shangri-la are spring and autumn ___ the temperature is at its mildest.A.whereB.on whichC.whenD.in that…”主要考查了你对  【状语从句】【限制性定语从句】【主语从句】【同位语从句】  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。