In fact___is a hard job for the police to keep order in such an important football matchA.it B.there C.that D.this 为什么选A

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In fact___is a hard job for the police to keep order in such an important football matchA.it B.there C.that D.this 为什么选A
In fact___is a hard job for the police to keep order in such an important football match
A.it B.there C.that D.this 为什么选A

In fact___is a hard job for the police to keep order in such an important football matchA.it B.there C.that D.this 为什么选A
it 作形式主语,用来替代to keep order in such an important football match,避免头重脚轻
原句应该是 To keep order in such an important football match is a hard job for the police

因为in fact后面缺主语,需要it作形式主语