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There is an expansion period during which after burning of t

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There is an expansion period during which after burning of the fuel may take place.
帮忙分析一下句子成分
从句中during which是做状语吗,那从句的主语是什么
我觉得after burning of the fuel 作状语which 作主语,所以句子应是这样:
There is an expansion period which after burning of the fuel may take place.
There is an expansion period during which after burning of t
定语从句
which 指代 expansion period 在从句中作主语
which may take place
after burning of the fuel 作时间状语 (介词短语,不可能作主语)