If a>1, which of the following is equal to $$\frac{2a+6}{(a^2+2a-

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If a>1, which of the following is equal to $$\frac{2a+6}{(a^2+2a-3)}$$

A、a
B、a+3
C、$$\frac{2}{(a-1)}$$
D、$$\frac{2a}{(a-3}$$
E、$$\frac{a-1}{a}$$

答案：C

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