问题
选择题
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
答案：C
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。