题目内容
The book was written in 1946, __________ the education system has witnessed great charges.
A. when B. during which C. since then D. since when
D。
解析:
since when中的when指1946,since when指的是since 1946,即指“自1946年起”。注意不要误选C,如果将C,如果将改为and since then,则可选C。
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