Tom________fifteen years old．A.is alreadyB.was alreadyC.has already beenD.had already been
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A解析分析：形成固定思维的同学一定会选C项，由于这里的动词是be，be的现在完成时表示的意思是：1)He has already been in Shanghai for two weeks．(他到上海已经有两个星期了)是表示从过去一直持续到现在的情况。2)He has already been to Beijing twice．(他到北京已经去过两次了)后面跟次数的话，是表示到某个地方去过几次了。这样Tom has already been fifteen years old．就会是这样的意思：Tom从过去某个时候起一直到现在都是处于十五岁，这样的意思岂不荒唐。用一般现在时tom is already．fifteen years old．，表示了现在这个时候，已经处于十五岁的情况。(延伸)“现在已经三点钟了。”英语应该是Now it is already three o'clock．