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This colorless gas is called oxygen,___ ___ fires burn much

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This colorless gas is called oxygen,___ ___ fires burn much better
which ,可以填with which吗
This colorless gas is called oxygen,___ ___ fires burn much
This colorless gas is called oxygen, ___in which ___ fires burn much better
答案是in which ,可以填with which吗
不可以;无色气体是氧气,火焰在氧气中烧的更好;
突出的是在氧气中,而不是有了氧气,燃烧本来就离不开氧气,所以用in 表示在氧气里
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