【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：---算盤是什么時候發(fā)明的？---由中國人在公園6世紀(jì)時發(fā)明。其一，算盤的發(fā)明是在過去，使用一般過去時。其二，算盤是被發(fā)明，使用被動。所以選出正確答案C。

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