【题目】It is global warming, rather than other factors, ___the extreme weather.
A. that have led to B. which has caused
C. which are causing D. that has led to
在线课程【答案】D
【解析】试题分析：考查强调句型。强调句型的基本结构为：it is/was被强调成分that/who其它成分；最大的特点是把it is…that/who…去掉，句子仍然成立。本题强调的是主语global warming.句意：正是全球变暖而不是其它的事情导致了极端天气。故D正确。