这是虚拟语气的用法之一,it is+important/necessary等形容词+that的时候引导的主语从句,从句不管是第几人称,谓语动词都是should+动词原形,should可以省去的,所以就选finish啦,这些字典里都有,你可以买一本字典瞧瞧,里面内容很多的
it is necessary that he ___the work within the month a can f
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