DO you know the history of the bridge___as long as 200 meters?为什么选measuring不选measured

measure 后边跟具体测量值或形容词时一般作系动词.后边跟测量的物体对象时才可做及物动词用.这里是measure做系动词的情况,所以选measuring不选measured.
例句：
using a ruler to measure a piece of paper
an instrument for measuring air pressure
mental abilities measured by IQ testing
He's being measured for a new suit.
His success cannot be measured solely on the basis of his popularity.
The cloth measures 3 meters.
The room measures 15 feet wide by 30 feet long.你的句子没有完全打出来，没法猜测came out 的意思和句子成份。
再说了，这里肯定不是定语后罝。后置的话是动词现在分词或者动
词过去分词而非你这里的动词过去式形式。