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More and more carbon dioxide is being re...

More and more carbon dioxide is being released into the air________the more severe global warming effects.

Acontributed to            Bto contribute to

Ccontributing to  Dto be contributed to

 

C 【解析】C 考查非谓语作状语。句意:越来越多的二氧化碳被释放到空气中,导致温室效应更严重。contribute to 导致,促使。空格处为现在分词作结果状语。  
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