請問下列哪些正確？
我原本覺得是(a3)和(b2)，但發現眾說紛紜。
(a1)It is the first time they met.
(a2)It was the first time they met.
(a3)It was the first time they had ever met.
(b1)The last time I saw him was four years ago.
(b2)The last time I had seen him was four years ago.
(b3)The last time I had seen him had been four years ago.
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