科目: 来源: 题型:022
A. People in China used the abacus (算盘) centuries ago.
B. The abacus was ______ in China several hundred years ago.
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科目: 来源: 题型:022
根据括号要求写出相应部分:
Edison's mother took him out of school and taught him ______ (她亲自).
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