问题补充:
The police said they would not give up looking into other possibilities they find out what happened.
A. as
B. while
C. until
D. although
答案:
A. as
B. while
(答案→)C. until
D. although
解析:考察连词。该句为not ……until……结构,直到……才……
句意为警察说他们不会放弃调查其他的可能性,直到他们发现到底发生了什么。