题目内容

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

直到向东走了一天一夜,他们才看见那片草地。

5. they had walked eastward由日寸间状语for a day and a night判断本句应该使用完成时态。由前面didn't see可知要用过去时态。所以本句用过去完成时。

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