_________is generally believed, it is human activities that have contributed to the global warming.
| A．As | B．That |
| C．What | D．It |
17-18高二·全国·课时练习 查看更多[2]
更新时间：2018-04-13 21:23:06
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【知识点】 as引导非限制性定语从句
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