( )The book was written in1946,_____ the education system ha

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( )The book was written in1946,_____ the education system has witnessed great challenges.
( )The book was written in1946,_____ the education system has witnessed great challenges.
A.when B,during which C.since which D.since when

答案选D,B和C哪里错了?为什么要用when来代先行词1946,而不用which?
求大神详解

( )The book was written in1946,_____ the education system has witnessed great challenges.
A.when B,during which C.since which D.since when
选D
根据has witnessed great challenges现在完成时,可知要用since引导时间状语从句.因为the education system has witnessed great challenges句子的主谓宾成分完整,which是关系代词,定语从句不需要做主语或宾语的which.定语从句缺少表时间的关系副词when.

( )The book was written in1946,_____ the education system ha 【高考】定语从句The book was written in1946,___the education system The book was written in 1946,_______ the education system ha The book was written in 1946,the education system has witnes the book was written in 1946,-----the education system has s The book was written in 1946,( )the education system has wit The book was written in 1946,__the education system has witn The book was written in 2001,___the education system has wit The book was written in 1946,_____the education system has w the book was written in 1946,{since when }the education syst 高三定语从句的题,1 The book was written in 1946,__the education syst The book was published( )it was written.