---Why was Mr. Smith suddenly fired by his boss?

---Because he was found_______ in the non-smoking office.

A．smoking

B．smoke

C．to smoke

D．smoked

关于咽后脓肿，哪一项是错误的（）

A.急性型常由咽后淋巴结化脓所致

B.慢性型多由颈椎结核引起

C.脓肿切开应取仰卧头低位

D.咽喉部脓肿切开，应做气管切开的准备

E.结核性咽后脓肿应常规做气管切开