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【题目】Its high time we _____ some actions to prevent pollution.

A. take B. took C. taking D. is taking

【答案】B

【解析】

试题分析:考察虚拟语气。Its high time that从句中必须使用虚拟语气,即从句使用过去式或谓语由should+动词原形构成,后种变化的should不能省略,所以答案是B。

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