there was no conclusive evidence, most people thought he was guilty.
A. Since
B. While
C. When
D. However
网友回答
A. Since
(答案→)B. While
C. When
D. However
解析：句意：尽管没有确凿的证据表明，但是大多数人都认为他有罪。A. Since因为、自从；B. While 表对比、虽然；C. When当…..的时候；D. However但是、无论怎样。由句意可知选B。
考点: 考查状语从句的用法。