A

A的解释
a.一,一个,一只,一件.
A的例句
I don't care what a car looks like as long as it gets me from A to B.
我倒不在乎汽车的样子, 只要能把我从一处载到另一处就行了.

Would you do me a favor?
你能帮我一个忙吗？