a. that lived at the same time as other legendary mammals
B. that had lived at the same time as had other legendary mammals
c. that lived at the same time those others had
d. living at the same time as those others did
e. living at the same time as those were
IMO A
usage of "had" not required
B. that had lived at the same time as had other legendary mammals
c. that lived at the same time those others had
d. living at the same time as those others did
e. living at the same time as those were
IMO A
usage of "had" not required

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