【題目】—When _________ personal computers _____________?

—In 1976.

A. is, invented B. did, invent

C. were, invented D. was, inventing

【答案】C

【解析】

試題分析:句意:-個人電腦是何時發(fā)明的-在1976年。personal computers是invent這一動作的承受者,該用被動語態(tài),結(jié)合答語中In 1976可知該用一般過去時被動語態(tài),又因主語是復(fù)數(shù),所以選C。

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