By the time Billy was 6, he in the sea.A.had already swumB.was already swimmingC.has already swumD.already swam
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A解析试题分析：考查时态，时间状语By the time，和前面的句子Billy was 6，可以知道时态是过去完成时，所以选A， 考点：考查时态点评：动词时态是高考考查的热点，需要考生记牢它们的用法及句法，还需有分析理解句子结构的能力。动词时态与语态也是高中阶段的重难点之一，需要考生能够理解句意进而对动词的时态做出正确的判断即学即练：— Remember the first time we met, Jim?— Of course I do. You _______ in the library. A. have read B. had read C. were reading D. read选C