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By the time I wanted to pay for this sweater ,I found I ___

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By the time I wanted to pay for this sweater ,I found I ___ my money in the pocket
A:lost B:have lost C:had lost D:lose
C.had lost.
过去完成时(past perfect):
①表示发生在过去的动作对现在造成的某种影响或结果,用来指定在另一个过去行动之前就已经完成了的一个事件.
②过去某动作一直持续到现在将来可能还要延续下去.句中的动作发生在过去之前(过去的过去),即过去完成时动作发生在过去的过去.He said he had been to Beijing twice.他说他已经去过北京两次.(因为“说”said就是过去式,而去北京的动作发生在说said 的过去,所以用过完而不用现完.  过去完成时常用的时间状语有   1.by the end of last year.By the end of last term,we had learned 5000 new words.  2.By the time sb.+动词过去式 如:The bus had already left by the time I got there.