题目

 Unfortunately, most of the patients that came to her clinic were babies, many ____________ were born to mothers addicted to cocaine. A. of what             B. of that        C. of which           D. of whom 答案：D（2009•鸡西）如图，Rt△ABC中，∠ACD=90°，直线EF∥BD，交AB于点E，交AC于点G，交AD于点F．若S△AEG=S四边形EBCG，则=    ．