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It took me a long time before I was able to fully appreciate what they __ for me.
A.had doneB.didC.would doD.were doing
A

试题分析:句意:我花费了很长的时间才能够完全领会他们为我所做的。句中was able to 都发生在过去的时间,而根据句意他们为我所做的,应该已经做完了,发生在took这个动作之前,即过去的过去,故选A
点评:动词的时态是学习英语过程中非常重要的知识。而很多的题目,句中并没有像本题一样有明确的时间,很多要通过上下文的判断得知。过去完成时表示动作发生在过去的过去,本题不难,平时加强记忆,理解即可。
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