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Farmers here _________keeping the soil rich and _________diseases.
| A．focus on…free of | B．center … free from |
| C．attend on… free of | D．depend on… free from |
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Farmers here _________keeping the soil rich and _________diseases.
| A．focus on…free of | B．center … free from |
| C．attend on… free of | D．depend on… free from |
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