It is already well understood___________ causes the global warming.A．whatB．whenC
题型：不详难度：来源：
It is already well understood___________ causes the global warming. |
答案
| A |
解析
| 考查名词性从句。此题为it 作形式主语，真正的主语是后面的从句，从句中缺少主语，所以用what。 |
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