That… seems unlikely.

That the beautiful girl agreed to be his girlfriend seems unlikely.

那个漂亮女孩似乎不太可能同意当他的女朋友。

That such a poor man could become a millionaire seems unlikely.

这样的一个穷光蛋竟然能成为百万富翁，这似乎不太可能。

功能：在语气上显得比较正式，大多用在正式问题中。