The secretary worked late into the night, _______ a long speech for the international conference.   [ ]

A. to prepare              

B. prepared  

C. preparing                

D. was preparing

单纯局灶性发作特点是（）。

A.无意识丧失，也无发作后不适

B.持续时间平均30～40分钟

C.一过性短暂意识障碍

D.EEG有典型的全脑同步3Hz棘慢复合波

E.全身肌肉强直痉挛