I'm very glad to see you,I_____(not know）you had come already

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I''mverygladtoseeyou,I_____(notknow）youhadcomealreadyI''mverygladtoseeyou,I_____(notknow）youhadcomealr

I'm very glad to see you,I_____(not know）you had come already
I'm very glad to see you,I_____(not know）you had come already

I'm very glad to see you,I_____(not know）you had come already
I'm very glad to see you,I__didn't know___(not know）you had come already

didn't know

haven't know

did not know .....原因是：在这个时候我已经见到了你，我是在这以前以为你没有来。。所以应该用did not know
个人见解，如有不对之处还请更正。。谢谢了。。

didn't know

indefinite、不确定