楼上的回答是正确的.
做题方法就是：
先把原来句子的主谓宾划出来,主语是they,谓语动词是built,宾语是that bridge,变成被动语态就是要把原来的宾语挪到主语的位置上去,原来的主语变成一个by+原来的主语（要用宾格）,中间的谓语动词要用被动语态的形式（be+过去分词）写出来,由于这个题的时态是过去时,所以be的形式就是was或者是were,在此我们知道是用前者.
怎么改被动语态?Thay built that bridge five years ago.
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