Hi there i also got this CIT 0520 Form,after i passed my test with 20 of 20,perfect! (On Nov 2014) and have been a crazy process cause in 2012 they sent me the RQ (that ask basically for same thing,proof of residence) and now this ,i cried a lot when i received this 0520 in the mail, i though it was the invitation for the oath,but nottt i opened it and CIC want more proof of my residence in this beautiful country,sad cause i have been a good citizen,since i leave my country(8 years ago) I never went back avoiding this kind of issues (without result) i know people who have been out of Canada for a long time,also they arrive in Canada long after me and they are already Canadian Citizens.( not jelous,just unfair)
I have been in 3 Islands each for a period of 7 days,so 21 days out of Canada only.I already sent all the documents request on Dec 18 but cristhmas and all this holidays make everything slow so not answer yet but please let me know if you received any notice,also I will.
Good luck