Mr Brown has three sons,two of them are doctors,______is a postman.

问题描述:

Mr Brown has three sons,two of them are doctors,______is a postman.

another=an+ other,只能用于三个或更多的人或物,泛指同类事物中的三者或三者以上的“另一个”,只能代替或修饰单数可数名词.