you can use "had", seeing does not decide the tense. You can say

本帖于 2016-10-23 16:23:21 时间, 由普通用户 Flyingstraw 编辑
回答: 请教, 谢谢!(加一个问题)虔谦2016-10-23 16:17:03

"Seeing you are happy, " or "seeing you were sad".

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好的,谢谢 Flyingstraw!原帖又加了一个问题:) -虔谦- 给 虔谦 发送悄悄话 虔谦 的博客首页 (0 bytes) () 10/23/2016 postreply 16:33:54

you can use: -Flyingstraw- 给 Flyingstraw 发送悄悄话 Flyingstraw 的博客首页 (137 bytes) () 10/23/2016 postreply 16:46:12

Okay, got it. Thank you again! -虔谦- 给 虔谦 发送悄悄话 虔谦 的博客首页 (0 bytes) () 10/23/2016 postreply 16:55:39

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