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

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

选项 A、take
B、taking
C、to take
D、took

答案 D

解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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PoordietistheleadingcauseofmortalityintheUnitedStates.【C1】______