when you go by train,make sure you take an express,____stops only at big station.A.one B.one that C.that Dwhat为什么选B

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when you go by train,make sure you take an express,____stops only at big station.A.one B.one that C.that Dwhat为什么选B

when you go by train,make sure you take an express,____stops only at big station.A.one B.one that C.that Dwhat为什么选B
when you go by train,make sure you take an express,____stops only at big station.
A.one B.one that C.that Dwhat
为什么选B

when you go by train,make sure you take an express,____stops only at big station.A.one B.one that C.that Dwhat为什么选B
因为前后是两个句子,逗号后面没有连词因此不能看作两个并列句,所以后面一句只能是从句.
从句必须有引导词,所以A不可以.
非限定性定语从句不能用that引导,定语从句不用what引导,所以C、D不可以
选B,
when you go by train(时间状语从句),make sure(谓语) you take an express(宾语从句),one(express的同位语) that stops only at big station(that引导限定性定语从句修饰one).

one做先行词,关系代词that做主语不可以省略

答案的确是B
ONE是an express的同位语,that修饰one。that是定语从句的连接词,也是这个定语从句部分的主语。