◎ 题干
The book was written in 1946, ____ the education system has witnessed great changes.

[     ]

A. when
B. during which
C. since then
D. since when
◎ 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 book was written in 1946, ____ the education system has witnessed great changes. [ ]A. when B. during whichC. since then D. since when …”主要考查了你对  【关系副词】【介词和介词短语】【非限制性定语从句】  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。