【題目】Personal computers ________ in 1976. It has changed the whole world.

A. have invented B. are invented C. were invented D. invented

【答案】C

【解析】

句意:個人電腦是1976發(fā)明的。它改變了整個世界?疾閯釉~語態(tài)題。Personal computers是復數(shù)主語,它是動詞invent的受動者,需用被動語態(tài)。in 1976是過去的時間,句子需用過去時,根據(jù)句意,可知選C。

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