题目内容
【题目】As we all know, ___________ 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】D
【解析】句中it作形式主语,真正的主语是不定式短语to keep order in an important football match,不定式短语的逻辑主语是the police。
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