灰灰poppy
That was the first and only time that I met him.既然是唯一一次,肯定表示的是过去发生的事。所以要用That,并且是过去时态。
小喵酱一小只
She was seen by me.她给我看见了。You saw him and so did I.你看见他;我也看见了他。I saw her.我看见她了。I had saw it.我已经看见它了。I saw him come.我看见他来了。I saw Tom himself.我看见汤姆本人了。I see him coming.我看见他来了。I see him yesterday.我昨天看见他了。I see Tom himself.我看见汤姆本人了。I observed him going out.我看见他出去了。
哈亮亮魔人
It was my first and the only time when I saw him.或者:That was the first and the only time for me to see him.