D
It is the first ( second ... ) time that ...该句型中的 that 从句谓语动词不用虚拟语气,而用完成时态.至于用什么完成时态,由主句的谓语动词的时态决定.如果是一般现在时,后面从句用现在完成时态；如果是一般过去时,后面从句则用过去完成时态.该结构中 that 可以省去；it有时用 this 替换．常译为”是第一（二）．．．次．．．”.
It is the first time I have been here. = This is the first time I have been here.