高等继续教育 / 电子商务英语
正确率：100%
题型描述: 单选题
＿＿＿＿＿＿＿＿pure lead, the lead ore is mined, then smelted, and finally refined.
A.To obtain
B.Being obtained
C.It is obtained
D.Obtaining
＿＿＿＿＿＿＿＿pure lead, the lead ore is mined, then smelted, and finally refined.
A.To obtain
B.Being obtained
C.It is obtained
D.Obtaining
参考答案：