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.
The book was written in 1946,__the education system has witn
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