Sales of CDs have greatly increased since the early 1990s.when people to enjoy the advantages of this new technology．( )A．beginB．beganC．have begunD．had begun 题目和参考答案——青夏教育精英家教网——

题目内容

6．Sales of CDs have greatly increased since the early 1990s，when people to enjoy the advantages of this new technology．（　　）

A．

begin

B．

began

C．

have begun

D．

had begun

分析 CD的销售自从二十世纪九十年代以来增长很快，当时人们开始享受这种新技术的优点．

解答答案是B．考查时态，该题中when引导的是一个非限制性定语从句，且when指代前面的the early 1990s，显然是过去的一个具体时间，所以用一般过去时态．

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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