I saw them _____ basketball at this time yesterday.

A．play

B．played

C．to play

D．playing

年长儿链球菌感染引起的上感可诱发（）

A.中耳炎

B.鼻窦炎

C.咽后壁脓肿

D.急性肾小球肾炎

E.泌尿系感染