题目内容
16．We ______ four thousand new words by the end of last year．（ ）| A． | learned | B． | had learned | C． | have learned | D． | will learn |
分析 去年年底我已经学会了四千新单词．
解答 答案：B．结合时间状语by the end of last year可知learn的动作发生在过去的过去用过去完成时had+过去分词，故答案是B．
点评 过去完成时（The Past Perfect Tense）：表示过去某一时间或动作以前已经发生或完成了的动作对过去的某一点造成的某种影响或是结果，用来指在另一个过去行动之前就已经完成了的事件．它表示动作发生的时间是"过去的过去"，侧重事情的结果．
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