There was a big fire yesterday. But everyone ________ escape from the burning building.

There was a big fire yesterday. But everyone ________ escape from the burning building.

A.could

B.were able to

C.abled to

D.was able to

答案及解析： D

解析：

D表示经过努力能或在危险、困难的情况下设法能，应用be able to，这里应用过去时且为单数。