Sustainable development is long-term ______which focuses on the environment and _____ natural resources．
| A．plan; preserve | B．plan; preserving |
| C．planning; preserving | D．planning ;preserve |
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Sustainable development is long-term ______which focuses on the environment and _____ natural resources．
| A．plan; preserve | B．plan; preserving |
| C．planning; preserving | D．planning ;preserve |
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