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$\frac{1}{1+\sqrt{3}}+\frac{1}{\sqrt{2}+2}+\frac{1}{\sqrt{3}+\sqrt{5}}+\ldots+\frac{1}{\sqrt{97}+\sqrt{99}}+\frac{1}{\sqrt{98}+10}=$
A. 9     B. $\frac{9}{2}$     C. $\frac{9+3 \sqrt{11}-\sqrt{2}}{2}$     D. $\frac{7+3 \sqrt{11}}{2}$         
不再提醒