Is oxygen the only gas( ) helps fire burn?Is oxygen the only gas(_英语解答

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：405 ℃　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