计算：23-3=______．-数学

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• 计算：2a27a+6a34a．-数学
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• Last week I took the Civil Service Admission Examination, for which I _____ for nearly three months．
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• The popular film Golden Compass ____ an imaginary world.A．set inB．is set inC．sets inD．is set on-高二英语
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