过去将来完成时的被动语态
The passive voice of the past future perfect tense
以上为机器翻译结果，长、整句建议使用 人工翻译 。
过去将来完成时的被动语态。校长说教学楼将在五月份之前建成。
The headmaster said that the teaching building would have been completed before May.
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