他终于读了他在外面时寄到的那封信。
He finally read the letter that had arrived while he was away.
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that英 /ðæt/|美 /ðæt/
had英 /hæd/|美 /hæd/
arrived英 /əˈraɪvd/|美 /əˈraɪvd/
解释
过去完成时 `had arrived` 在 `that` 从句中，说明信在主句动作读之前到达，`while he was away` 进一步框定背景时间段。
He finally read the letter that had arrived while he was away.
过去完成时 `had arrived` 在 `that` 从句中，说明信在主句动作读之前到达，`while he was away` 进一步框定背景时间段。