I           sooner but I didn’t know that they were waiting for me.

A．had come

B．was coming

C．would come

D．would have come

室间隔缺损的部位常位于室间隔的什么部位（）

A.膜周部

B.室上嵴下

C.室上嵴内

D.肌部

E.以上部位同时发生