It seems necessary that population growth______(每隔一段时期调查一次).(should)be surveyed

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问题 It seems necessary that population growth______(每隔一段时期调查一次).

选项

答案 (should)be surveyed at intervals

解析 ①在It seems necessary that结构中，从句谓语动词用虚拟语气。②另外，还考查了被动语态和短语at intervals。

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