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判斷本句應該使用完成時態。由前面didn't see可知要用過去時態。所以本句用過去完成時。
題目來源：高考英語組合訓練多項選擇+完成句子 > 組合訓練43-44
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