I rather doubt that you really know me.

你说你真的认识我，对此我表示怀疑。

youdao

I rather doubt that.

我非常怀疑。

youdao

I rather doubt (that).......

我很怀疑……(通用)。

youdao

I rather doubt (that).......

我很怀疑……(通用)。

youdao