题目内容

Personal computers ______ in 1976. It has changed the whole world.
A．have inventedB．were invented
C．is inventedD．invented
B

试题分析：根据in 1976可知，本句应该是过去时，故排除AC；本句的主语是Personal computers“个人电脑”，故应该用被动语态were invented。本句的意思是“个人电脑发明于1976年。”所以本题选B。
点评：完成本题时，首先应注意时态，然后确定语态问题。因为电脑的发明不是电脑完成的，而是人完成的，故用被动语态。
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