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英语
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it's necessary that the problem__in some way or other
a.is settling b.was settled
c.be settled c.has been settled
括号内选哪个 表示哪种虚拟语气的用法
人气：163 ℃ 时间：2020-03-21 05:17:06
解答
c.be settled
it's necessary that 主语 + should(可省略)+ 动词原形
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