“I won’t ________ to this place! ”The girl said angrily(生气地).
A:return
B:return back
C:returned
D:returned back
已知曲线C: x2+y2b=1与抛物线y2=4x的一个交点为M,F为抛物线的焦点,若MF=4,则b的值为( )