问题补充:
--As we know,China is still a country while the U.S.A. is a country.
A.developing;developed B.developed;developing C.developed;developing
答案:
解析:句意:正如我们所知,中国还是一个发展中的国家,而美国是一个发达国家。developing正发展着的,developed发展过了的,发达的,故选A。
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