题目内容
2．It took me a long time before I was able to fully appreciate what they__ for me．（ ）| A． | had done | B． | did | C． | would do | D． | were doing |
分析 句意：我花费了很长时间才完全领会他们为我所做的．
解答 答案A． 句中was able to 表示发生在过去的时间，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 本题是基础题，考查过去完成时，时态的题目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．
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