垂直距离通常指（）。

A．眼裂至口角的距离

B．鼻底至口角的距离

C．口角至颏底的距离

D．鼻底至颏底的距离

E．上下牙槽嵴顶间的距离

The speaker ______ have criticized the paraprofessionals, knowing full well that they were seated in the audience.

A．should not to

B．must not

C．ought not to

D．may not