-When _________ the abacus _________?-In the sixth century by the Chinese people.[ ]A. is; inventedB. did; inventC. was; inventedD. does; invent-初中英语-n多题

◎ 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

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◎ 解析

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◎ 知识点

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