useful 这个词首字母发的是辅音【j】,所以用a.
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he has pointed out that the tree is a useful source of income.为什么要用a而不用an?
he has pointed out that the tree is a useful source of income.为什么要用a而不用an?
新概念第二册58课中的句子,
新概念第二册58课中的句子,
英语人气：961 ℃时间：2020-04-03 12:06:58
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