答案: B
3.As we all know,it is human activity that________the global warming.
A.has come from B.have come from
C.has led to D.have led to
解析: 句意为:众所周知,是人类的活动“导致(lead to)”了全球变暖。主句是强调句型,是对主语human activity的强调,谓语动词用单数,故选C项。
答案: C
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