Question

We __ the breakfast just now ( finish)​

Answer 1

We *finished* the breakfast just now ( finish)

Finished" is correct because it is the Past Simple.

We use the Past Simple to speak about events that happened in the past.

"Have finished" isn't correct because it is the Present Perfect. An hour ago is in the past (a past time) and isn't connected to the present anyhow. If it were still happening it would be correct.

Example:

We have finished our breakfast and are now ready to leave. (Have finished just now and we can do other things)

We do not use the present perfect with an adverbial which refers to past time which is finished.

Answer 2

Answer:

have finished

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