题文
__________ in her office for nearly 20 hours, she is going home to have a rest.
| A．To work |
| B．Working |
| C．To have worked |
| D．Having worked |
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__________ in her office for nearly 20 hours, she is going home to have a rest.
| A．To work |
| B．Working |
| C．To have worked |
| D．Having worked |
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