We ________trees in our school in March or April every year．
| A．plant and water |
| B．planting and watering |
| C．planted and watered |
| D．plants and waters |
We ________trees in our school in March or April every year．
| A．plant and water |
| B．planting and watering |
| C．planted and watered |
| D．plants and waters |
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