◎ 题干
The best times to visit Shangri-la ______ spring and autumn because the temperature is _____ its mildest.

A. is: in
B. are; in
C. is; at 
D. are; at
◎ 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 best times to visit Shangri-la ______ spring and autumn because the temperature is _____ its mildest. [ ]A. is: in B. are; in C. is; at D. are; at …”主要考查了你对  【介词和介词短语】【系动词】  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。