The book was written in 1946, _______ the education system has witnessed great changes.
A．since thenB．whenC．since whenD．during which
C

試題分析：句意：那本書被寫于1946年，自從那時以來教育體制見證了偉大的變化。因為逗號前后都是句子所以必須用連詞，故排除A；這里是非限制性定語從句，先行詞是1946，又根據(jù)謂語動詞has witnessed可知，since與現(xiàn)在完成時連用，，故選C。
點評：本題難度適中。定語從句是高中階段的重難點之一，需要考生有分析理解復(fù)雜的句子結(jié)構(gòu)的能力，熟練掌握關(guān)系詞的意義及句法功能。這里考生容易誤選D。
即學(xué)即練: The Chinese government has made the Mid-Autumn Festival a legal holiday, ______ people will have a day off.
A. when           B. which          C. where        D. what
解析：A。the Mid Autumn Festival為先行詞，指時間在從句中作時間狀語，因此引導(dǎo)詞用when。
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