It is global warming, not other things, ______ the extreme weather.
A．that have led toB．which has causedC．which are causingD．that has led to
D

試題分析：考查強調(diào)句型。強調(diào)句型的基本結(jié)構(gòu)為：it is/was被強調(diào)成分that/who其它成分；最大的特點是把it is…that/who…去掉，句子仍然成立。本題強調(diào)的是主語global warming.句意：正是全球變暖而不是其它的事情導(dǎo)致了極端天氣。故D正確。
點評：強調(diào)句型的基本結(jié)構(gòu)為：it is/was被強調(diào)成分that/who其它成分；最大的特點是把it is…that/who…去掉，句子仍然成立。
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