The human beings have polluted the environment seriously．It is time _

2级

单选题The human beings have polluted the environment seriously．It is time __________the United Nations must take some measures．

参考答案：D进入在线模考

D[分析]结构应用
本句考察的是虚拟语气结构。It is(about／high)time that…句型用虚拟语气，其谓语部分用一般过去时，因此D为答案。

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