must have been done
网络释义
表示对过去被动的推测
新概念IIlesson 45-48笔记精要 ...must have done 表示对过去的推测must have been done 表示对过去被动的推测wrap up 包裹 ...
如果这样就能用.
must have been done 可以和many year ago用不?但是many year ago只用于过去时
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