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
人气：305 ℃ 时间：2019-10-29 19:19:49
解答
BD呢？the only 只能用that选D 不是B弄错了选D这是定语从句的语法知识
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