【题目】_________ is generally believed, it is human activities that have contributed to the global warming.
A. It B. As C. that D. what
在线课程【答案】
【解析】
试题分析：考查定语从句。句意：人们普遍认为，正是人类活动导致了全球变暖。As在此处引导非限制性定语从句，指代逗号后面主句的内容，并在定语从句中充当主语。故选B项。
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is generally believed, it is human activities that have contributed to the global warming.A. It B.
编辑：chaxungu时间：2026-04-27 03:06:16分类：高中英语题库
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