The stones they carried were used houses and bridges. A.to build B.for building C.to be build
问题描述：
The stones they carried were used houses and bridges. A.to build B.for building C.to be build
D.AandB
在used后面选择
答
选D
be uesd to do被用于做某事
be used for doing sth 被用于做某事
两者相同 常可互换
另外注意
习惯于做某事be used to doing,
过去常常做某事used to doA、B、D都有说选的，到底选什么啊因为A和B都对，所以选D啊！！！！！！你见过几个选择题会给出D. A and B 这种选项正是因为AB都对 所以才给了这么个选项 The stones （they carried ）were used to build houses and bridges.The stones（ they carried） were used for building houses and bridges.