Though the ship sunk all the people on her be resuced.A. couldB. shouldC. had toD. were a

问题补充：

Though the ship sunk, all the people on her be resuced.

A. could

B. should

C. had to

D. were able to

答案：

A. could

B. should

C. had to

(答案→)D. were able to

解析：could表示过去的能力，were able to表示过去做成了某事。句意：虽然船沉了但是所有的人获救了。