In fact is a hard job for the police to keep order in an important football match.A. this

问题补充：

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

答案：

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。