求 Security checks __ only a measure in the fight against in

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求 Security checks __ only a measure in the fight against in the terrorism. 添什么为什么?

are / seem / remain --------只能用系动词填空,这里的选项都是正确的.
再问：为什么前面是are后面用a呢
再答：你好。因为Security checks是复数形式，在这里Security checks决定用are,不是a measure决定用is,measure只能做表语。

求 Security checks __ only a measure in the fight against in 3men were killed in the fight against terro in the fight aga some people keep a dog to help them in the fight against oth A group of people in Italy want to fight against the spread ‘robots in the fight against landmines’什么意思? I was the only time in the fight啥意思 because,a rival in love,I only a fight . in a dress with checks是什么意思 __ loud music in public is against the law .A play B Having in a measure actors是什么意思英语翻译Unit2的（ROBOTS IN THE FIGHT AGAINST LANDMINES)课文翻译 Checks-in是什么意思