Do you have any doubt ------- a cure for AIDS will be found soon?that or if

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Do you have any doubt ------- a cure for AIDS will be found soon?that or if
Do you have any doubt ------- a cure for AIDS will be found soon?
that or if

Do you have any doubt ------- a cure for AIDS will be found soon?that or if
that
doubt vt.
怀疑; 不信; 拿不准(后接名词从句时,疑问句和否定句用连词 that,but,but that,肯定句一般用连接词 whether,if,what,when 等,如肯定句用 that,往往表示非常怀疑)

that,这是个句型