问题
选择题
It is global warming, not other things, ______ the extreme weather.
A．that have led to
B．which has caused
C．which are causing
D．that has led to
答案
答案：D
题目分析：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。
点评：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。