5. They didn't see the grassland until        for a day and a night (eastward)

直到向東走了一天一夜，他們才看見那片草地。

5. they had walked eastward由日寸間狀語for a day and a night判斷本句應(yīng)該使用完成時(shí)態(tài)。由前面didn't see可知要用過去時(shí)態(tài)。所以本句用過去完成時(shí)。

題目來源：高考英語組合訓(xùn)練多項(xiàng)選擇+完成句子 > 組合訓(xùn)練43-44

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