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题目
题型:不详难度:来源:
The book was written in 1946, _____ the education system has witnessed great changes.
A.whenB.during whichC.since whenD.since then

答案
C
解析

试题分析:
句意:这本书被写于1946年,自从那时起,教育体制就发生了巨大的改变。when引导的定语从句,在从句中作时间状语。后文用到完成时态,故用since when.
点评:本题极易选D. since then自从那时以来它不能引导定语从句,如果改为and since then即正确,本句since then只作时间状语,没有连词功能。定语从句都不缺主,宾语时用关系副词引导。
核心考点
试题【The book was written in 1946, _____ the education system has witnessed great cha】;主要考察你对定语从句等知识点的理解。[详细]
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