It is high time that this controversy____put an end to. A was B is C were D be

问题描述:

It is high time that this controversy____put an end to. A was B is C were D be
请给详细解释!谢谢!

选A.这是需用虚拟语气的固定句式:It is high /about time that+主语动词过去式或should+动词原形(注:这个特殊should不可省略)故选A