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Sustainable development is long-term ________which focuses on the environment and  ________ natural resources.
A．plan; preserveB．plan; preserving
C．planning; preservingD．planning ;preserve
C
考查名詞及動詞。plan計劃；planning n. 規(guī)劃,計劃,設計。focus on doing集中做，根據句意選C。
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