【題目】 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】

試題分析：since when中的when指1946，since when指的是since 1946，即指“自1946年起”。注意不要誤選C，如果將C改為and since then，則可選C。

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