Theworld'ssuppliesofcopper（） A: havegraduallybeingexhausted B: aregraduallyexhausted C: hasbeengraduallyexhausted D: arebeinggraduallyexhausted
Theworld'ssuppliesofcopper（） A: havegraduallybeingexhausted B: aregraduallyexhausted C: hasbeengraduallyexhausted D: arebeinggraduallyexhausted
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