Question

一道初三英语题，希望有讲解谢谢，急在线等

As we all know, wood and stones ______ bridges in the past.
A) used to build B) used to building
C) were used to build D) were used to building

Answer 1

C
wood and stones作为主语，是复数，木头和石头是被用来造桥，所以用被动，something be used to do something短语的意思是“某物被用来做/作某物或某事”。时间状语in the past表明要用过去式，are的过去式是were，所以选择C项。

Answer 2

c被用来做，A是曾经做，D是习惯做，B无这个短语

Answer 3

答案是，d，in the past 表示一般过去时，，USD TO (be )doing sth 过去通常用于做什么的用法