题目内容
20.When they arrived at the train station,the plane has taken off.把has 改为had.分析 当我们到达火车站时,飞机已经起飞了.
解答 答案是:把has 改为had;本题考查时态;我们到达火车站是过去,飞机起飞是我们到达火车站前,是过去的过去,故需要过去完成时,把has 改为had.
点评 句子改错要在理解句子结构的基础上从词语搭配、词性、单复数、时态、非谓语动词等方面进行综合考虑,分析可能存在的错误;
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