北京研彩大孝现代远程教育 What were you doing at nine last night? (过去进行体) She had left before you came here. (过去完成体) 。 She was surprised by the crazy ideas. (被动语态)• What were you doing at nine last night? （过去进行体） • She had left before you came here. （过去完成体） • She was surprised by the crazy ideas. （被动语态）