—Jerry, ______ eat in the classroom.
—Sorry, I _______.
A:doesn't, don't
B:don't, don't
C:don't, won't
D:not, not
122-58=____
已知三棱锥S-ABC中,底面ABC为边长等于2的等边三角形,SA垂直于底面ABC,SA=3,那么直线AB与平面SBC所成角的正弦值为( )