【单选题】
The IPCC announcement three years ago that "most of the warming observed over the last 50 years is" ______.
A.possibly due to human activities
B.possibly because human activities
C.due to likely human activities
D.human activities likely attributable
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根据网考网移动考试中心的统计,该试题:
57%的考友选择了A选项
18%的考友选择了B选项
13%的考友选择了C选项
12%的考友选择了D选项