---Come on,Kitty.---Oh, good heavens! Both my legs are nearly to give out. I_______ for hours like a dog.A.have been walkingB.had walkedC.was walkingD.walked
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A解析本题考查动词时态。根据句中的my legs are nearly to give out可知本题应该使用现在完成进行时,表示答话人一直走了几个小时的路,因此腿上没有一点儿力气了。