John is an honest man.I say it, ( )I have opposed him

John is an honest man.I say it, (while )I have opposed him----米基是个诚实的人，尽管我曾反对过他，我还是要这样说。
as if---好像，仿佛。
so that---为此，以便。
that--那样，那么，那，那个
while---虽然，当...的时候。在这个句子中是 虽然，尽管 的意思。