【题目】It is high time that we(concentration) on protecting the environment.
在线课程【答案】concentrated/should concentrate
【解析】句意：到时间我们要关注于保护环境的时间了。It is high time that...属于虚拟语气谓语动词用动词过去时或者should+动词原形。故填concentrated/should concentrate。
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It is high time that we on protecting the environment.
编辑：chaxungu时间：2026-04-27 03:03:29分类：高中英语题库
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