She opened her eyes with a start and was about to cry out _____ she heard her father urgently telling her to keep quiet.
| A．while |
| B．when |
| C．before |
| D．after |
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She opened her eyes with a start and was about to cry out _____ she heard her father urgently telling her to keep quiet.
| A．while |
| B．when |
| C．before |
| D．after |
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