单项选择题

______pure lead, the lead ore is mined, then smelted, and finally refined.

A．Obtaining
B．Being obtained
C．To obtain
D．It is obtained
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单项选择题
The radio______by my son just now.
A．has been repaired
B．is being repaired
C．repaired
D．has repaired
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The food that Mark is cooking in the kitchen______delicious.
A．smells
B．is smelling
C．has smelled
D．has been smelling
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