The fossil fuel once burned will react a lot of toxic gas,like sulfur dioxide.这句话哪错了?

The fossil fuel once burned will react a lot of toxic gas,like sulfur dioxide.这句话哪错了?
英语人气:852 ℃时间:2020-03-26 16:05:49
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Once the fossil fuel burn, it will react a lot of toxic gas,like sulfur dioxide.
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