◎ 题干
This kind of machines were made ______.
[     ]
A: in the 1950s
B: in the 1950
C: in 1950s
D: in 1950's
◎ 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“This kind of machines were made ______.[ ]A: in the 1950s B: in the 1950 C: in 1950s D: in 1950's …”主要考查了你对  【日期】  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。