To find the correct subtitle file for that matches the CMRG release group (specifically the Revenge.2017.HDRip.AC3.X264-CMRG encode), you should look for "helpful papers" (subtitle files) on dedicated databases.
If you download a file and the subtitles are slightly off-sync: subtitle Revenge.2017.HDRip.AC3.X264-CMRGReveng...
Since subtitle files are version-specific to ensure the text lines up perfectly with the audio (sync), using a file specifically tagged for or HDRip is crucial to avoid "lag" or "early" text. Top Sources for Revenge (2017) Subtitles To find the correct subtitle file for that
: While primarily for YTS releases, they often host "HDRip" or "WebRip" subtitles that are compatible with the CMRG timing. Troubleshooting Sync Issues subtitle Revenge.2017.HDRip.AC3.X264-CMRGReveng...