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20．When they arrived at the train station，the plane has taken off．把has 改為had．

分析當我們到達火車站時，飛機已經(jīng)起飛了．

解答答案是：把has 改為had；本題考查時態(tài)；我們到達火車站是過去，飛機起飛是我們到達火車站前，是過去的過去，故需要過去完成時，把has 改為had．

點評句子改錯要在理解句子結(jié)構(gòu)的基礎(chǔ)上從詞語搭配、詞性、單復數(shù)、時態(tài)、非謂語動詞等方面進行綜合考慮，分析可能存在的錯誤；

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