—Why don't you _____ the music club?

—I'm sorry. I can't sing or dance. [ ]

A. to join

B. join

C. joining

D. to join in

三叉神经痛的触发点或扳机点常常存在于（）。

A.眼角和眉间

B.鼻根、额部

C.颏部和下颌

D.口角、鼻翼近颊部、舌侧缘

E.耳前近颞颌关节处