Personal computers ______ in 1976. It has changed the whole world.

A．have inventedB．were invented
C．is inventedD．invented

B

解析試題分析：根據(jù)in 1976可知，本句應(yīng)該是過(guò)去時(shí)，故排除AC；本句的主語(yǔ)是Personal computers“個(gè)人電腦”，故應(yīng)該用被動(dòng)語(yǔ)態(tài)were invented。本句的意思是“個(gè)人電腦發(fā)明于1976年。”所以本題選B。
考點(diǎn)：本題考查被動(dòng)語(yǔ)態(tài)。
點(diǎn)評(píng)：完成本題時(shí)，首先應(yīng)注意時(shí)態(tài)，然后確定語(yǔ)態(tài)問(wèn)題。因?yàn)殡娔X的發(fā)明不是電腦完成的，而是人完成的，故用被動(dòng)語(yǔ)態(tài)。

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