The book was written in 1946, ____ the education system has witnessed great char
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
| 在本题中用since when引导定语从句。因为句中的谓语has witnessed是现在完成时,所以要用since when。when指代上文中的in 1946,表示“这本书是1946年写的,从那以后,教育体制发生了巨大变化”。 |
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