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已知 $\frac{\cos \alpha}{\cos \alpha-\sin \alpha}=\sqrt{3}$, 则 $\tan \left(\alpha+\frac{\pi}{4}\right)=$
A. $2 \sqrt{3}+1$     B. $2 \sqrt{3}-1$     C. $\frac{\sqrt{3}}{2}$     D. $1-\sqrt{3}$         
不再提醒