The book was written in 1946, ____ the education system has witnessed great changes. A．when ..
Thebookwaswrittenin1946,____theeducationsystemhaswitnessedgreatchanges.A．whenB．during...
The book was written in 1946, ____ the education system has witnessed great changes. A．when B．during which C．since then D．since when
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| D |
| 考查定语从句。since when以为“从那时起”，when时间副词，这里指代时间 1946，相当于since when的意思就是since the year 1946。句意：自从1946年起，教育体系经历了巨大变革。 |
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