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$ cat data.txt
1,2,3,4,5,6,7,8,
1,2,3,4,5,6,7,8,9
1,2,3,4,5,6,7,8,9,10,
1,2,3,4,5,6,7,8,9,10,11
1,2,3,4,5,6,7,8,9,10,11,12,
1,2,3,4,5,6,7,8,9,10,11,12,13
1,2,3,4,5,6,7,8,9,10,11,12,13,14,
$ awk '{if ($0 ~ /,[ \t]*$/) {printf("%s?\n", $0)} else {print}}' data.txt
1,2,3,4,5,6,7,8,?
1,2,3,4,5,6,7,8,9
1,2,3,4,5,6,7,8,9,10,?
1,2,3,4,5,6,7,8,9,10,11
1,2,3,4,5,6,7,8,9,10,11,12,?
1,2,3,4,5,6,7,8,9,10,11,12,13
1,2,3,4,5,6,7,8,9,10,11,12,13,14, ?