Is oxygen the only gas( ) helps fire burn?

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• Is oxygen are the only gas____ helps fire burn?
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• 英语 定语从句 1.The speaker spoke of some writers and some books___were popular then.A.\ B.that C.which D.who.1.Is oxygen the only gas ___helps fire burns?A.\ B.that C.which D.it.3.He tore up my photo and ___upset me.A.whose B.that C.which D.who4.A desktop computer is a computer ___is designed for ude on the desk.A.whose B.where C.which D.who5.This is the best hotel in the city___I know.A.where B.that C.which D.it.做好把句子翻译一下。
• Is oxygen the only gas( ) helps fire burn?Is oxygen the only gas( ) helps fire burn?A.it B.which C.不填 D.that
• This colorless gas is called oxygen,___ ___ fires burn much betterwhich ,可以填with which吗
• Is oxygen are the only gas____ helps fire burn?A.thatBwhichC.it为什么不能选B?
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• This colorless gas is called oxygen,___ ___ fires burn much better
• Is oxygen the only gas( ) helps fire burn?
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