It is his horse , according to the old man , _______ saved him from the trap.

A．who

B．that

C．which

D．what

进行性吞咽困难见于（）

A.胃食管反流病

B.食管癌

C.食管静脉曲张

D.食管炎

E.食管贲门失弛缓症