I didn’t know this was the first time you _____ here.I _ you had been here at least onceA.have come; think B.has come; have thoughtC.had come; have thought D.had come; thought

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

I didn’t know this was the first time you _________ here.I _____ you had been here at least onceA.have come; think B.has come; have thoughtC.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