【題目】Scientists have (提出) theories about how the universe came into being.

【答案】put；forward
【解析】句意：科學家們已經(jīng)提出了關(guān)于宇宙是怎樣形成的理論。短語：put forward提出。此處是現(xiàn)在完成時，所以答案是put forward.

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