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21. Carbon Dioxide may be absorbed by trees or water bodies, or it may stay in the atmosphere when _____, while it is only in the atmosphere that chlorofluorocarbons find their home.
(A) cars that release emissions
(B)emissions are released by cars
(C) by releasing emissions from cars
(D) released from car emissions

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 【站僕】摩檸Morning：有沒有達人來解釋一下?
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21. Carbon Dioxide may be absorbed by tr..-阿摩線上測驗