It was global warming , rather than other causes , led to the extreme weather .
A. which
B. who
C. that
D. what
网友回答
A. which
B. who
(答案→)C. that
D. what
解析：句意为：是全球变暖而不是其它原因导到致了这极端的天气。在本题中去掉It was 与空白处，剩余的部分正好构成句子， Global warming rather than other cause led to the extreme weather. 由此可知，这里是强调句型，其基本结构为：It is/was +被强调部分+that+剩余部分。故答案应为C。