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Only one child of the thirty passengers in the plane _____ after the air crash.
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If most winners __________ (捐献) a day's pay to the Hope Project, then it will be hopeful.
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Have you read the __________ about animals in the newspaper?
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1年前
如果代数式x的四次方+ax³+3x²+5x³-7x²-bx²+6x-2 合并后不含x³,x²项,求(ab)b-a次方的值
1年前