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Tony used to be a quiet student, ________ now he is active in class.
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Don't put off till tomorrow ________ you should do today!
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We haven’t discussed ______ yet.
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If you want to eat more __________(health), you should eat less meat and more vegetables.
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试说明无论x取怎样的值代数式(8-7x-6x²+2x³)+(x³+5x²+4x-1)-(-x²-3x+3x³-3)的值都与x无关
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