过去完成时表示过去某时前已经发生的事: When I saw him.he had been ill for a month. 我见到他时他已病了一个月了。 He couldn’t see anyone.The thieves had gone. 他没看见什么人,小偷已经跑了。 He showed me the books he had bought. 他让我看了... 阅读全部 »

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