阅读短文，选出填入空格最合适的一项： Before the new hospit…

阅读短文，选出填入空格最合适的一项：

Before the new hospital opened, the city carried out a ___ review of its health services, covering everything from emergency care to the training of nurses. The review took eighteen months and involved more than two hundred doctors, patients and local officials, and its final report made forty recommendations. Officials say it was the first time that every part of the system had been examined at once.