— Can you imagine what is Jack doing now? He is playing football outside while everyone else is busy in class!

— He　　　　 his homework, I think.

A．must have finished

B．must finish

C．can’t have finished

D．mustn’t have finished

睡眠呼吸暂停综合征患者影像学检查，观察下列哪些部位情况有助于上气道狭窄的判断（）

A.咽侧壁

B.扁桃体

C.腭垂

D.舌体

E.软腭