The book was written in 1946, ___ ___ the education system has witnessed great
题型：不详难度：来源：
The book was written in 1946, ___ ___ the education system has witnessed great charges.| A．when | B．during which | | C．since then | D．since when |
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答案
| 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改为and since then，则可选C。 |
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