题文
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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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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