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【it'snecessarythattheproblem__insomewayorothera.issettlingb.wassettledc.besettledc.hasbeensettled括号内选哪个表示哪种虚拟语气的用法】
题目内容：
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优质解答
c.be settled
it's necessary that 主语 + should(可省略)+ 动词原形
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
优质解答
it's necessary that 主语 + should(可省略)+ 动词原形
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