题文
Sit down, Emma. You will only make yourself more tired，__________ on your feet.
| A．to keep |
| B．keeping |
| C．having kept |
| D．to have kept |
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Sit down, Emma. You will only make yourself more tired，__________ on your feet.
| A．to keep |
| B．keeping |
| C．having kept |
| D．to have kept |
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