高二英语选择green forms of energy are ---- we need to slow global warming.what which that how which one?& reason ,thanks

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高二英语选择green forms of energy are ---- we need to slow global warming.what which that how which one?& reason ,thanks
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高二英语选择green forms of energy are ---- we need to slow global warming.what which that how which one?& reason ,thanks
高二英语选择
green forms of energy are ---- we need to slow global warming.
what which that how
which one?& reason ,thanks

高二英语选择green forms of energy are ---- we need to slow global warming.what which that how which one?& reason ,thanks
what

what引导的是名词性的从句,在从句中what 做宾语

need sth to do sth ===(we )need (green forms of energy )to (slow global warming)

which how 肯定不行
由连接词that引导的宾语从句,that在句中不担任任何成分,所以也不选that