with her work, she didn't even notice the heavy snowfall outside the window.
A. Occupying
B. To be occupied
C. Having occupied
D. Occupied
网友回答
A. Occupying
B. To be occupied
C. Having occupied
(答案→)D. Occupied
解析：考查非谓语动词。分析句子结构可知，此处用过去分词作原因状语。be occupied with sth 表示“忙于某事”。