【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(gè)人電腦是何時(shí)發(fā)明的？-在1976年。personal computers是invent這一動(dòng)作的承受者，該用被動(dòng)語(yǔ)態(tài)，結(jié)合答語(yǔ)中In 1976可知該用一般過(guò)去時(shí)被動(dòng)語(yǔ)態(tài)，又因主語(yǔ)是復(fù)數(shù)，所以選C。

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