More and more carbon dioxide is being released into the air，________the more severe global warming effects.
A．contributed toB．to contribute to
C．contributing toD．to be contributed to
C
C　考查非謂語(yǔ)作狀語(yǔ)。句意：越來(lái)越多的二氧化碳被釋放到空氣中，導(dǎo)致溫室效應(yīng)更嚴(yán)重。contribute to 導(dǎo)致，促使�？崭裉帪楝F(xiàn)在分詞作結(jié)果狀語(yǔ)。
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