It is already well understood causes the global warming. A. what B. when C. that D. how
2022-12-04 01:46:14 185次 2013-2014学年北京市石景山区高三上学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
It is already well understood causes
the global warming.
A. what B. when C.
that D. how
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