One of the boxes is open. The verb agrees with the subject, one. We was is not standard english, it is used in some regional dialects:
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Is there any rules for i was/were? 1) some of the best known writers of. Bonnie, along with her associates, was invited to the gathering.
Purdue owl has this example which is almost identical to op's case:
From other's conversation,i found out they mentioned i was and sometimes they also mentioned i were. What is the difference between were and have been, and are these sentences gramatically correct? Do i use was or were in this sentence?