（）There is no greater pleasure than lying on my back in the middle of the grassland, _____at the night sky.
| A．to stare | B．staring |
| C．stared | D．having stared |
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（）There is no greater pleasure than lying on my back in the middle of the grassland, _____at the night sky.
| A．to stare | B．staring |
| C．stared | D．having stared |
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