A Frenchman who lost his arms and legs successfully swam across the Channel, a challenge he for two yearsA.has been preparingB.had been preparingC.has preparedD.prepares
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B解析这题考查现在完成进行时的用法：现在完成进行时表示过去到现在一直在进行的动作，句意是：一个失去膀子和腿的法国人成功的游过了海峡，这是他准备了两年的挑战。选B。