:( Best thing to do if that happens is to take a screenshot and send it straight to the staff team through the bug report form: https://support.duolingo.com/hc/en-us/requests/new
I checked but don't see a Report. If your sentence is rejected you should make a report so we can see the full sentence. If there is a mistake we can help you or we might have a mistake we need to fix.
So, look at the other comments on this page and you'll see one that tells you how to Report when your answer is rejected. Then we'll be able to help.
If we could see your answer then we might be able to help. But we moderators cannot see them unless you make a REport.
We moderators cannot see your sentence therefore before you posted your comment here you should have made a REPORT.
Here's how to report.
Go to the bottom of the exercise page where you'll see REPORT Click on that:
Then choose what you want to REPORT: (You'll see these to choose from.)
-The audio does not sound correct.
-The dictionary hints on hover are wrong or missing.
-The Greek sentence is unnatural or has an error.
-The "Correct solution" is unnatural or has an error.
-My answer should be accepted. This is the one you should click on if your translation was not accepted.
After choosing the REPORT you want to make you should post on the comment page.