2.By the time he got to the airport,the plane had taken off.（改一般疑问）

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• By the time he got to the airport,the plane had taken off.改为一般疑问句
• 2.By the time he got to the airport,the plane had taken off.（改一般疑问）
• By the time he got to the airport,the plane had taken off.改为一般疑问句
• 2.By the time he got to the airport,the plane had taken off.（改一般疑问）
• _____ have not time ______56.--- I’d like Mary to type the report.--- Don’t trouble her.She _____ have not time ______ it before she leaves.A.must,to finish B.would,to finish 为什么呢?
• 完成句子 She might have been in time for the train,but she_______ too late.(set)She might have been in time for the train,but she_______ too late.(set)她本来可能赶上火车的,但她出发得太晚了.这个题的答案是set out.过去时态.为什么不能用had set out 就时间上而言,set out出发确实是在赶上火车之前,所以这点上过去完成时说得通,以有没有赶上火车为一个过去的时间点,那么set out出发确实是过去的过去.就用完成时态的影响而言,出发得晚了,导致没赶上火车,也是可以说的通的.那么为什么这里要用过去时态,而不能用过去完成时呢?请具体解答.尤其从为什么不能用过去完成时方面解答.