Ace and Sam were painting a house. Ace painted $$\frac{3}{10}$$ of the house. Sam painted $$\frac{2}{10}$$ more than Ace. What fraction of the house still needs to be painted? 
选项为:A:$$\frac{2}{10}$$  B:$$\frac{3}{10}$$  C:$$\frac{5}{10}$$  D:$$\frac{8}{10}$$  请回答其中一个选项.