The fire spread through the hotel very quickly but everyone get out.A. had toB. wouldC.

问题补充：

The fire spread through the hotel very quickly, but everyone get out.

A. had to

B. would

C. was able to

D. could

答案：

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。