After a silence of several minutes为什么要用a?

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Afterasilenceofseveralminutes为什么要用a?Afterasilenceofseveralminutes为什么要用a?Afterasilenceofseveralminute

After a silence of several minutes为什么要用a?
After a silence of several minutes为什么要用a?

After a silence of several minutes为什么要用a?
在以元音开始发音的单词前用an、在以辅音开始发音的单词前用a