题目内容
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:
解析:
此题中when为关系代词,意为“那时”,指1946年,由“has witnessed”决定用介词since。例如:We came back on Tuesday,since when we have been working in the repair shop.我们星期二回来,从那时起就一直在修配间工作。
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