题目内容

The book was written in 1946, __________ the education system has witnessed great charges.
A．whenB．during which
C．since thenD．since when
D。
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改为and since then，则可选C。
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