Question

他以前没去过博物馆。

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Answer

①He hasn’t been to the/ a museum before. ②He has never been to the/ a museum before.

【解析】

have been to曾经去过，其否定形式为have not been to或have never been to，the/ a museum博物馆，before以前，主语为he，故动词have应用第三人称单数形式。组合起来可得句子He hasn’t been to the/ a museum before或He has never been to the/ a museum before，符合中文句意，故答案为①He hasn’t been to the/ a museum before. ②He has never been to the/ a museum before.