这个句子是虚拟语气
句式构成It is time sb+过去分词
分析这个句子,It is time the authorities concerned took proper steps to solve the traffic problems句意是:相关的政府部门是时候采取行动来解决交通问题了,concerned 是authority的后置定语,句子中的逻辑主语是 it,真正主语是the authorities concerned took proper steps to solve the traffic problems,系动词是is,表语是time,concerned表示相关的。
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