题目内容

1．He works in a factory now，but he _______ on a farm for 20years．（　　）
A．workedB．has worked
C．had workedD．had been working

分析 他在一家工厂工作，但他在农场工作了20年了．

解答 答案是A．根据句意可知，他现在在工厂工作，言外之意 在农场工作20年是过去发生的事情，所以后面用一般过去式．需要注意的是，这题容易误选C，C 是过去完成时，是过去的过去，但在题中无法找到一个过去式，且在农场工作发生在这个过去式之前．并不是见到for就一定要用完成时，只有强调从过去一直持续到现在，有可能持续到将来，或者对现在有影响时用完成时．故答案为A

点评 高考题目对时态的考查是重点，谓语动词要与时间状语保持一致，时态与时间是密不可分的，各种时态却要受到时间和语言环境的限制，根据题干提供的时间或者时间状语体现的时间来判断句子的时态是最直接的解题方法，扎实的语法功底加上准确的理解至关重要．

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