Question

More and more carbon dioxide is being released into the air，________the more severe global warming effects.

A．contributed to	B．to contribute to
C．contributing to	D．to be contributed to

Answer 1

C

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。