—I apologize for not being able to join you for dinner.

—________. We’ll get together later.

A．Go ahead

B．Not to worry

C．That’s right

D．Don’t mention it

与口角糜烂无关的因素（）。

A.B族维生素缺乏，导致营养不良

B.细菌感染

C.先天遗传

D.真菌感染

E.老年无牙患者，颌间距缩短