You can manage this several ways:
1. MC maintains a databases entries for every CD it sees. So long as you've tagged the CD reasonably before ripping, you can construct a view that will show you which CDs have rips and which ones don't. Thus, you don't even need to insert the disc, but can quickly look to see if it exists in the view (physical and ripped).
2. When you rip, fill in a tag value unique to the CD, such as the UPC or your own ID. This identifier will be stored not only in the physical CD's reference in the MC CD database, but will also carry forth to the the ripped tracks as well. You can setup a view that will show you both the physical disc and the ripped tracks, based on this identifier (I use a
CD reference ID, one of my early learning experiences regarding MC and its capabilities).
3. So long as your ripped tracks are stored in a location that is derived from tags such as Album, Artist, Track #, Name, etc. (which either come from online look-ups, or worst case, you enter them before rip the CD) you can use these tags to construct a view that shows both the physical CD entry as well as the entry for the ripped tracks (and you may have several formats).
All of these techniques allow you to see in a view both the physical CD's database entry, and the ripped tracks, so you can quickly determine what is ripped and what is not.