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

          試題分析:根據(jù)in 1976可知,本句應該是過去時,故排除AC;本句的主語是Personal computers“個人電腦”,故應該用被動語態(tài)were invented。本句的意思是“個人電腦發(fā)明于1976年!彼员绢}選B。
          點評:完成本題時,首先應注意時態(tài),然后確定語態(tài)問題。因為電腦的發(fā)明不是電腦完成的,而是人完成的,故用被動語態(tài)。
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