题目

He couldn't continue to live such a poor life, so he left home, ______ not to come back if he couldn't get rich. A . determining B . determined C . determine D . being determined 答案:B用简便方法计算下面各题.(1)2+4+6+…+18+20(2)20-19+18-17+…+4-3+2-1.
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