题目内容
The abacus was invented ________ by Chinese people.
- A.in the sixth Century
- B.in the sixtieth Century
- C.in the sixteenth Century
- D.in the six Century
A
根据常识算盘是6世纪发明的,表达时用序数词。
根据常识算盘是6世纪发明的,表达时用序数词。

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B.did, invent |
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