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

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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

解析环境污染已十分严重。联合国是时候采取措施了。本题考查it is time that sb. did sth. “是时候做某事了”结构，故选D项。

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