在平面直角坐标系中，$O$为原点，$A(-1,0）$，$B(0,\sqrt{3})$,$C(3,0)$，动点$D$满足$\left|\stackrel{\rightharpoonup }{CD}\right|=1$,则$\left|\stackrel{\rightharpoonup }{OA}+\stackrel{\rightharpoonup }{OB}+\stackrel{\rightharpoonup }{OD}\right|$的取值范围是（  ）

A．	$[4,6]$	B．	$[\sqrt{19}-1,\sqrt{19}+1]$
C．	$[2\sqrt{3},2\sqrt{7}]$	D．	$[\sqrt{7}-1,\sqrt{7}+1]$