Most of the big hotels in Shanghai were full last week but finally wefind a room in a sma

问题补充：

Most of the big hotels in Shanghai were full last week, but finally wefind a room in a small one.

A. ought to

B. could

C. were able to

D. might

答案：

A. ought to

B. could

(答案→)C. were able to

D. might

解析：句意，上周，上海的大多数大的宾馆都满了，但是最后，我们找了一间小的。表示过去通过努力终于做成了某事要用beableto，而不能用can，又因为是发生在过去的事情，故用一般过去时。