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A Frenchman who lost his arms and legs successfully swam across the Channel, a challenge he           for two years.
A.has been preparingB.had been preparing
C.has preparedD.prepares
B
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。
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