英语写作高级句型 It took them a long time to realize they had made a mistake.过了很久，他们才意识到犯错了。3) spent as much time as he could doing sth.(花尽可能的时间做某事)例如：He spent as much time as he could remembering new words.他花了尽可能多时间记新单词。4) Since + 主语 + 过去式，主语 + 现在完成式例如：Sin
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