She walked slowly into the hall and at once noticed that all

題目：

She walked slowly into the hall and at once noticed that all the room doors were open,yet following her regular practice she had shut them before going out.
分詞做狀語中的哪種情況,following的邏輯主語是哪個
是分詞的獨立結構嗎

解答：

yet 後面跟著的是個完整的句子「 Following her regular practice,she had shut them (the doors) before going out." ,現在分詞這裡應該是做方式狀語,主語是 she