来自刘振华的问题
完型1.Somecitiesarecrowded.Theyhavebusortrains____tohelppeopletravelthroughthem.
完型1.Somecitiesarecrowded.Theyhavebusortrains____tohelppeopletravelthroughthem.


完型1.Somecitiesarecrowded.Theyhavebusortrains____tohelppeopletravelthroughthem.
完型1.Somecitiesarecrowded.Theyhavebusortrains____tohelppeopletravelthroughthem.
Somecitiesarecrowded.Theyhavebusortrainstationstohelppeopletravelthroughthem.