Editor
If $\theta$ is an angle in quadrant III and $\tan(\theta-30^{\circ})=\cot 30^{\circ}, then $\theta$=
Difficulty: Easy
A: 
$60^{\circ}$
B: 
$240^{\circ}$
C: 
$270^{\circ}$
D: 
$225^{\circ}$
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