一、过去完成时的被动语态的构成
1. 过去完成时的被动语态的肯定式: had + been + done。
*The task had been finished before 12: 00 yesterday.
昨天12点之前这项任务已经完成了。
2. 过去完成时的被动语态的否定式: had + not + been + done。
*The task hadn’t been finished before 12: 00 yesterday.
昨天12点之前这项任务还没完成。
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