作业帮是a unit of 还是an unit of 为什么
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是a unit of 还是an unit of 为什么
是a unit of 还是an unit of 为什么
是a unit of 还是an unit of 为什么
应该是a unit of
因为用冠词 an 还是 a 要看的是后面的那个单词的开头第一个字母是否原音~是原音的话就用an 否则就用a~但是U就比较特别~因为从音标看它的开头是j,为辅音,所以就用a unit of 记得要看音标!
还有hour是比较特别的~因为这里h不发音~所以用的是an hour~
其实两种写法都可以的.
但是比较经常用A
a 因为unit的u发y的音
a unit of
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