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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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