科目: 來源: 題型:022
A. People in China used the abacus (算盤) centuries ago.
B. The abacus was ______ in China several hundred years ago.
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科目: 來源: 題型:022
根據(jù)括號要求寫出相應(yīng)部分:
Edison's mother took him out of school and taught him ______ (她親自).
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