应该用an, a用在辅音前面，记住是辅音，不是辅音字母；an用在元音前面
important 第一个音节为元音【i】使用an时，条件有三：①这个名词的读音必须是以元音音素开头--即它的 音标的第一个音素是元音，而不是说它是以元音字母开头。②它必须是个可数名词。③它还必须是个单数名词。...
是an important thing还是a important thing
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