高手帮忙：That was written in 1946, since______the education syst

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高手帮忙：That was written in 1946, since______the education system has undergone great changes.
A then B when C there D which 选B.可我不明白为什么不选A呢,
since then 不是加现在完成时吗? 比如 I visited China in 1900. since then, china has undergone great changes. 不是很正常吗?给我详细说说吧,我都失望了,那么多人都觉得不屑的问题我咋就不懂呢.

since在这里是自从的意思后跟的句子缺时间状语所以用when
That was written in 1946, since______the education system has undergone great changes.考的是定语从句
I visited China in 1900. since then, china has undergone great changes. 前后两句在语法上没有联系

高手帮忙：That was written in 1946, since______the education syst 高三定语从句的题,1 The book was written in 1946,__the education syst the book was written in 1946,{since when }the education syst The book was written in 1946,the education system has witnes The book was written in 1946,__the education system has witn The book was written in 1946,_______ the education system ha the book was written in 1946,-----the education system has s The book was written in 1946,_____the education system has w The book was written in 1946,( )the education system has wit The book was written in 2001,___the education system has wit ( )The book was written in1946,_____ the education system ha this is the only book that was written by Lu Xun in the libr