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I would always use "that was," because to my ear, "that's" always implies "that is," and your sentence is in the past tense.
Answer
#4: Attribution notice removed
by
System
·
2019-12-13T12:00:27Z (about 5 years ago)
Source: https://writers.stackexchange.com/a/15936 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
by
System
·
2019-12-08T03:58:58Z (about 5 years ago)
Source: https://writers.stackexchange.com/a/15936 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would always use "that was," because to my ear, "that's" _always_ implies "that _is_," and your sentence is in the past tense.
#1: Imported from external source
by
System
·
2015-01-19T14:40:24Z (almost 10 years ago)
Original score: 3