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请教各位几道题目，麻烦了
1.Anyone with absolute ,or perfect,pitch are able to identify by ear any note at some standard pitch or to sing a specified note at will.
答案选a，可是不太明白，是不是改成is阿
2.Established in 1948 ,the State University of New York is the singly largest university system in the United States.
答案选b，改成single 吗？
3. Because of their rapidly changing economically fortunes, many frontier towns of the American West underwent spectacular fluctuations in population in the nineteenth century.
答案选b，这个没错，可是前面的rapidly是修饰谁呢，后面的分词吗？请教各位
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发表于 2005-8-12 11:25:00
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