The book was written in 1946,__the education system has witnessed great changes.Awhen Bsince when

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The book was written in 1946,__the education system has witnessed great changes.Awhen Bsince when
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The book was written in 1946,__the education system has witnessed great changes.Awhen Bsince when
The book was written in 1946,__the education system has witnessed great changes.
Awhen Bsince when

The book was written in 1946,__the education system has witnessed great changes.Awhen Bsince when
B正确.逗号后的定语从句中用了现在完成时,since when = since the year of 1946自从1946年至今.1946年是先行词,when是关系代词,指代了先行词,同时when又作为介词since的宾语.而since when用作副词短语,是从句中的时间状语.

since then, 自打那儿以后

B.since when 这是定语从句，先行词 是1946，关系副词是when。
这样你明白了吧：The education system has witnessed great changes in 1946，when the book was written.

b
since后面加when引导的状语从句
A不是一段时间

The book was written in 1946 (A) when the education system had witnessed great changes.

when

when, 定语从句，in 1946是地点状语。

a 选A，witnessed是及物动词，后面要加宾语，句子中great change是它的when是关系副词，在不却成分的前提下，看先行词1946，时间就用when，地点就

since when
看到，____ 典型的非限定性定语从句 先行词1946，用which 然后看到has witnessed完成时用since
这本书是在1946年被完成的，自那之后（since which）教育系统见证了巨大的变化。

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