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Marque a 'Third conditional sentence' correta que representa a seguinte situação: "They didn´t see their friends at the party. They didn´t join them."

If they hadn´t seen their friends at the party, they would have joined them.

They wouldn´t have joined their friends at the party if they had seen them.

If they had seen their friends at the party, they would have joined them.

If they had seen their friends at the party, they must have joined them.

They couldn´t have joined their friends at the party if they had seen them.​