[单选题] 提问人:匿名网友 提问时间:2021-08-24

Exposure to lead has fallen sharply _______.


A .because scientists have warned people of its danger.
B .after the research was done
C .as people moved out of old houses
D .since it was removed from paint and gasoline.

提问人:匿名网友 提问时间:2021-08-24

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