You can play any notes on a bass around a chord. Each chord has it's own notes in it that sound good, but notes not in the chord can sound good as well, depending on the context. If you're playing C and G to back up a C chord, you would probably want to play A and E to back up an A chord.
Don't be afraid to try other notes in between (such as E on the C chord if it's major, Eb if it's minor and C# or C for the A chord) and keep trying notes until they sound good. There are plenty of notes to play behind chords (pretty much any note is good, listen to a "walking" bass line) so just experiment until you find one that sounds right.
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