The book was written in 1946, _____ the education system has witnessed great changes.
A．whenB．during whichC．since whenD．since then
C

試題分析：
句意：這本書被寫于1946年，自從那時起，教育體制就發(fā)生了巨大的改變。when引導的定語從句，在從句中作時間狀語。后文用到完成時態(tài)，故用since when.
點評：本題極易選D. since then自從那時以來它不能引導定語從句，如果改為and since then即正確，本句since then只作時間狀語，沒有連詞功能。定語從句都不缺主，賓語時用關系副詞引導。
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