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EmmaBakerHi PreciousJones,The correct answer here is 2. EXCEPT it should read: What I did was combine the material and designs of these two items to make it a more complete and useful item.You cannot say "What I did was combined" because the verb 'to do' is already in the past tense (did) so there is no need to put any subsequent verbs in the past.You cannot mix the tenses