题目内容
【题目】The book was written in 1946, ___ the education system has witnessed great changes.
A.when
B.during which
C.since then
D.since when
【答案】D
【解析】考查定语从句。句意:这本书是在1946年写的,自从1946年起,教育体系见证了巨大的变化。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,不用关系代词用关系副词。then不能引导定语从句。故选D。
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