用a
用a或an是根据它后面那个词定的,不管是名词还是形容词
如果后面那个词的音标的第一个字母（也就是发的第一个音）是元音,就要用an
比如an important meeting,an average data.
虽然useful的第一个字母是原因,但它发的不是元音的音,所以还是用a
Ex .English is___ useful language.
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