_________is generally believed, it is human activities that have contributed to the global warming. ...
2022-09-27 05:15:55 51次 《课时同步君》2017-2018学年高二英语人教版选修7-4.2 Unit 4 Learning about Language 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
_________is generally believed, it is human activities that have contributed to the global warming.
A. As B. That
C. What D. It
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