It is high time that we _____________(保护濒临灭绝的动物)． protected the endangered anima

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问题 It is high time that we _____________(保护濒临灭绝的动物)．

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答案 protected the endangered animals

解析虚拟语气：假设性虚拟语气句型it is (high) time (that) we did sth．， that 引导的从句中谓语动词应使用过去式。词汇：endangered(有危险的)

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