In fact is a hard job for the police to keep order in an important football match.
A. this
B. that
C. there
D. it
网友回答
A. this
B. that
C. there
(答案→)D. it
解析：考查形式主语。It是形式主语，to keep order in an important football match才是真正的主语。句意：对警察来说在重要的足球赛中维持秩序是一项艰苦的工作。