This is the second time __I have been here.A.that B.when C.in which D.which

1This is the second time that（that是连接词） +句子（谓语动词是现在完成时）
2 This was the second time that（that是连接词） +句子（谓语动词是过去完成时）
翻译：这是某人第几次做某事