--When _____ the abacus _____? -- In the sixth century by the Chinese people.A．is, inventedB．did, inventC．was, inventedD．does, invent-初中英语-魔方格

◎ 题干

--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

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◎ 解析

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◎ 知识点

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