问题补充:
So absorbed in the research that she didn’t hear someone knocking at the door.
A. she did
B. did she
C. she was
D. was she
答案:
A. she did
B. did she
C. she was
(答案→)D. was she
解析:句意:--她是如此专注于研究以至于他没有听到有人敲门。这里使用了so…that…句型,so+adj/adv.如果放在句首,句子用部分倒装,因为词组be absorbed in专注于,所以将was提前,所以选D。