$$\frac{a}{b}$$=$$\frac{c}{d}$$=$$\frac{2}{3}$$ and 0

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$$\frac{a}{b}$$=$$\frac{c}{d}$$=$$\frac{2}{3}$$ and 0
Quantity A:$$\frac{a}{b+1}$$

Quantity B:$$\frac{c}{d+2}$$

答案：D

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