Woodandstones________bridgesinmany

发布时间：2020-07-26 19:51:51

Wood and stones ________ bridges in many countries．A.used to buildB.were used to buildingC.were used to buildD.used to building

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C解析be used在这里是被动语态，解释“被用来……”，后接to do sth．．
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