【題目】--When _____ the abacus _____? -- In the sixth century by the Chinese people.

A. is, invented B. did, invent

C. was, invented D. does, invent

【答案】C

【解析】

試題分析:句意:---算盤(pán)是什么時(shí)候發(fā)明的?---由中國(guó)人在公園6世紀(jì)時(shí)發(fā)明。其一,算盤(pán)的發(fā)明是在過(guò)去,使用一般過(guò)去時(shí)。其二,算盤(pán)是被發(fā)明,使用被動(dòng)。所以選出正確答案C。

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