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【题目】--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】

试题分析:句意:---算盘是什么时候发明的?---由中国人在公园6世纪时发明。其一,算盘的发明是在过去,使用一般过去时。其二,算盘是被发明,使用被动。所以选出正确答案C。

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