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

Theworld’ssuppliesofcopper______. A: havebeengraduallybeingexhausted B: hasgraduallyexhausted C: aregraduallyexhausted D: arebeinggraduallyexhausted

Theworld'ssuppliesofpetroleum_______. A: havebeengraduallyexhausted B: havegraduallyexhausted C: arebeinggraduallyexhausted D: aregraduallyexhausted