问题补充：
It was eveningwe reached the little town of Winchester.
A. that
B. until
C. since
D. before
答案：
A. that
B. until
C. since
(答案→)D. before
解析：当主句谓语动词表示一段时间或受一段时间的状语修饰时，常用before，意为“才”或“还未……就……”。如：
1）It was quite some time before he found the elephant at all.
过了好长时间他才发现大象。
2）We had walked a long way before we found some water.
我们走了老远的路才发现水。
