问英语主谓一致问题2all possible means ____to prevent the fire from sp

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问英语主谓一致问题2
all possible means ____to prevent the fire from spreading.
答案说是has been tried ,但为什么不是have been tried?means单复数同型这里为什么不是复数?

这句话的翻译是采取所有可能的方式去阻止火的蔓延!
所有可能的方式是指一个整体所以是单数要看你怎么理解呢
就跟family 一样有的时候就是复数家庭成员有的时候就是单数指家庭整体 means (方法)是单复数同形的词,谓语的数要靠意义来判断.

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