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quack的一般过去时为：quacked...
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quack的现在完成时为：quacked...
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quack的复数形式为：quacks...
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quack的第三人称单数（三单）为：quacks...
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n.江湖医生，江湖郎中，（鸭子的）呱呱声vi.（鸭子）发出嘎嘎声...
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quack的现在进行时为：quacking...
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...quack doctors charming money out of the pockets of credulous health-hungry citizens.从那些渴望健康而又容易上当受骗的市民那里骗钱的江湖郎中Suddenly he heard a quack.他突然听见一声嘎嘎的叫声。For the rest it was just a noise, a quack - quack - quacking.除此之外,便...
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Why do intelligent people find quack remedies so appealing?为什么聪明人会被江湖医术所吸引？Suddenly he heard a quack.他突然听见一声嘎嘎的叫声。He describes himself as a doctor, but I feel he is a quack.他自称是医生, 可是我感觉他是个江湖骗子....