There is a（n）__________ of plants in the old man's yard, such as trees, flowers and grass.
| A．group |
| B．kind |
| C．amount |
| D．variety |
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There is a（n）__________ of plants in the old man's yard, such as trees, flowers and grass.
| A．group |
| B．kind |
| C．amount |
| D．variety |
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