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：该题考查考生能否区别could与was able to。was able to表示在困难的情况下，经过一番努力而“能”成功的做什么。Could表示“过去的能力”，但不一定成功，句意：火很快向旅店蔓延，但大家都能出去了。故D答案最佳。