Two non-zero real numbers, $x$ and $y$, satisfy $(x+y)^{2}=3xy$. Which of the following is a possible value of $$\frac{x+y}{y}-\frac{x-y}{x}$$? (Adapted From 2000 AMC 12 Problems, Question \#11) 
选项为:A:$-1$  B:$-\frac{1}{2}$  C:$\frac{1}{2}$  D:$1$  E:$$2$$  请回答其中一个选项.