疫气的致病特点是（）

A.病邪相兼为病

B.易损伤脏腑

C.直接伤及内脏

D.易阻滞气血

E.一气一病，症状相似

I fell and hurt myself while I（）basketball yesterday.

A.was playing 

B.am playing 

C.play 

D.played