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现在完成时的被动语态 — 英语选择题

重庆大学版·英语（高中）英语选择性必修第三册 AI 三重审校通过

题目

All the old paintings in the gallery ___ carefully by experts before the exhibition opened to the public, so visitors can now enjoy them safely. A. have restored B. have been restored C. had restored D. were restoring

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现在完成时的被动语态 — 英语选择题

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