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问题: What's this in English?

What's this in English?
It's a pen.
What's this?
It's "V".
为什么第一个用a,第二个就不用a了,可以用吗?

解答:

你自己都知道是针对字母问的,就像是人的名字一样了,I am Tom.怎能加冠词a,an呢?
如果不是针对字母来问,就加上a,an.
There is a"b"in the word "boy".