The actor ________ basketball regularly for some years when he was young.         [ ]

A. was playing  

B. played      

C. has played      

D. had played

关于肺型血吸虫病的叙述，正确的是（）

A.为虫卵沉积引起的肺间质性病变

B.呼吸道症状较重

C.多见于慢性血吸虫病患者

D.有明显肺部体征

E.易导致肺源性心脏病