The fire spread through the hotel very quickly but everyone get out.
A. had to
B. would
C. was able to
D. could
网友回答
A. had to
B. would
(答案→)C. was able to
D. could
解析：考查情态动词的基本含义。had to：不得不； would：表示意愿或过去常常；could倾向于表示经过长期训练而获得的能力；was able to 表示经过努力而能够做到的事或成功地做了某事。因此，答案是C。