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If the global population goes on increasing at its present rate, by the middle of the 21 st_______century, we all our oil reserves.
If the global population goes on increasing at its present rate, by the middle of the 21 st_______century, we all our oil reserves.
A.will have used up
B.are using up
C.will have been using up
D.have used up
正确答案是A
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