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參考答案:
題目: 在我昨天回家之前，我已經買好晚餐了。
I had already bought my dinner before I went home yesterday.
題目: 在他離開韓國之前，他已經在韓國玩了二十天。
He had played in Korea for twenty days before he left.
題目: 如果你當初有邀請 David，他就會來。
If you had invited David, he would have come.
