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Fifty million Americans are addicted() nicotine.A toB atC inD on
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A.toB.atC.inD.as
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【C17】A.onB.atC.inD.within
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【C19】A.ofB.atC.inD.for
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【C10】A.forB.atC.inD.until
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【C5】A.SinceB.After a whileC.AgainD.Before long
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The child was knocked _____ by a passing car.A.onB.atC.inD.down