I can't give a complete answer since their is no available tense to use.
If this were to be past tense, the answer would be (were), as in already happened.
If this were to be present tense the answer would be (was), as in right now.
*Not Complete, but if you can give me a specific tense that they want to use I can give more explanation*
(If this helped Mark Brainliest)
