It could be omitted but I prefer it left in.
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Joseph A"that" optional
When 'that' introduces a content clause, it's optional after all short introductory clauses like the following:
[someone]
said (that)
knew (that)
thought (that)
decided (that)
felt (that)
hoped (that)
guessed (that)
promised (that)
expected (that)
...
The list is enormously long, bu