_____many times, they succeeded _________ the experiment.

A．Having tried; in doing

B．Tried; in being done

C．Having tried; to do

D．Tried; doing

定向障碍开始于意识障碍的哪种情况下（）

A.嗜睡状态

B.昏睡

C.昏迷

D.意识模糊

E.谵妄状态