Construyó -- or-- construyo
Which one is true?
La colina donde se construyó el complejo......
o
La colina donde se construyo el complejo......
4 Answers
Use the accented o (construyó). This site has a nifty conjugation tool, click here to see the complete conjugation for the verb construir.
So as you can see from the previous answers the accent is really important, not only does it change the tense but it changes who's doing the action 
construyo - I build - Present tense
se construyó - was built (by someone) - Past tense (preterite)
Ok. I know that point. The exact phrase that I would like to translate is
"the hill where the complex was built"
than
does the translation is
La colina donde se construyó el complejo......
or
La colina donde se construyo el complejo......
???
I am not exactly sure what you are asking, but if you want to know the preterit form of construir then it is construyó (with the accent mark on the letter o).
