他们还没开始吃饭，就已经把蛋糕吃完了。
They'd already finished the cake before starting the meal.
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They'd英 /ðeɪd/|美 /ðeɪd/
解释
They'd 是 They had 的缩写形式，had 是助动词 have 的过去式，与过去分词连用构成过去完成时，表示在过去某个时间点之前已经完成的动作。
They'd already finished the cake before starting the meal.
They'd 是 They had 的缩写形式，had 是助动词 have 的过去式，与过去分词连用构成过去完成时，表示在过去某个时间点之前已经完成的动作。
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