I didn’t know this was the first time you _________ here.I _

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I didn’t know this was the first time you _________ here.I _____ you had been here at least once
A.have come; think
B.has come; have thought
C.had come; have thought
D.had come; thought

D 第一个用完成时态,第二个”认为“是过去的事,现在已经不这样认为
再问：为什么一个用过去完成时
再答：简单点说就是”第几次做某事、第几个做某事“接从句都要用完成时态，前面是is就用现在完成时，前面是was就用过去完成时

I didn’t know this was the first time you _________ here.I _ I didn't know her at all.That was the first time I ( )to her I hear this is the first time you _____ here. -Don't you know our town at all?-No.This is the first time I but i don't think you can smoke here.I didn't know this is a i didn't know you __(be ) here -Hello,i didn't know you were here. Hello!I didn’t know you were here. The first time I----------here you ever been here before?This is the first time I( )to the I didn`t know what was the matter还是I didn`t know whatt he ma i didn't know you had called the police before l came here