摘要： 现在完成时 主动语态:hashave done 被动语态:hashave been done The classroom looks tidy. We have cleaned it. 教室看起来很整洁.我们已经打扫了. The classroom looks tidy. It has been cleaned. 教室看起来很整洁.它已经被打扫了 Many foreign films have been shown on TV since last month. 上个月以来.电视中播放了许多外国影片. The radio has not been turned on yet. 收音机还没开. Has a new training centre been set up in our town 我们镇上新的培训中心建好了吗?

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