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

John is an honest man.I say it,( )I have opposed him
A.as if
B.so that
C.that
D.while

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.