17. 【2019 • 内蒙古呼和浩特市】She was so angry at __________ he was doing __________ she walked out without a word.
      A. what; that           B. that; what            C. what; what                 D. that; that
【答案】A 
【解析】句意：她对他所做的事很生气，以至于她一言不发地走了出去。第一空考查what引导的宾语从句；第二空考查so…that…如此……以至于……。故选A。