She cared more about her students than her own health. That’s why two years passed _____ she was treated for breast cancer.
| A．since |
| B．before |
| C．after |
| D．until |
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She cared more about her students than her own health. That’s why two years passed _____ she was treated for breast cancer.
| A．since |
| B．before |
| C．after |
| D．until |
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