_________ pure lead, the lead ore is mined, then smelted, and finally refined.
A、Obtaining
B、Being obtained
C、To obtain
D、It is obtained
【正确答案】：C
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_________ pure lead, the lead ore is mined, then smelted, and finally refined.
A、Obtaining
B、Being obtained
C、To obtain
D、It is obtained
【正确答案】：C
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