问题补充：
So absorbed in her work that she didn’t realize I was behind her.
A. did she
B. was she
C. she did
D. she was
答案：
A. did she
(答案→)B. was she
C. she did
D. she was
解析：考查倒装句。be absorbed in 沉浸于….; So/such结构放在句首，后面使用部分倒装。这个句子的陈述语序：She was so absorbed in her work that she didn’t realize I was behind her.
句意：她是如此沉浸于她的工作，以至于她没有意识到我在她后面。
