$$10+11+12+13+14=\left(30+31+32+33+34\right)-$$． 
Overseas Competition->Knowledge Point->Calculation Modules->Whole Numbers->Whole Numbers Addition and Subtraction 
Add five $$20$$\textquotesingle s to $$10+11+12+13+14$$ to get $$30+31+32+33+34$$. The answer is $$\text{D}$$. 