It is hoped that Shanghai will establish friendly relations with more foreign cities in the future.
这是We/people hope that...这个主动句改为被动句的结果。that从句由宾语从句变成了主语从句,为了避免头重脚轻,用it作形式主语,that从句外置。by us/people省略。
例如下句:
People say that Tom is a good boy. 主动句
It is said that Tom is a good boy.被动句
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