题目

题型：不详难度：来源：

—Was the driving pleasant when you went to Mexico last summer?
—No, it ________ (rain) for four days when we arrived, so the roads were very muddy.

答案

had been raining　

解析

考查时态。答句句意：在我们到达之前下了四天的雨，道路异常泥泞。表示在过去某一动作之前一直在进行，并有可能继续下去的动作，用过去完成进行时。