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The computer was invented in the 1940’s and ______ quite a lot ever since.


  1. A.
    was changed
  2. B.
    had changed
  3. C.
    has been changed
  4. D.
    will change
C
试题分析:考察时态。本题的关键在于后面的时间状语ever since自从,该短语要和现在完成时连用。句意:电脑是20世纪40年代发明的,从那以后一句发生了很大的改变。故C正确。
考点:考察时态
点评:时态题的考查关键是抓住句子的上下文含义和句中的时间状语。要根据时间状语来选择合适的时态,在平时的学习中要注意积累有关时态的用法和各种时态的特殊之处。如since, so far等经常与现在完成时连用。在条件状语从句中用一般现在时代替将来时等等。
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