When you go by train,please see to it_you take an express,_that stops only at big stations.A.that,oneB./,the oneC.that,itD./.it答案是A.求解释

问题描述:

When you go by train,please see to it_you take an express,_that stops only at big stations.
A.that,one
B./,the one
C.that,it
D./.it
答案是A.求解释