None. C++/C though.
D feels a lot like a less verbose version of C++.
It feel like anything huge changed, but there are definitely a lot of small changes and a lot of syntactic sugar.
There's also a garbage collector (that can be turned off, apparently) and some other language features, that really ease development.
I also appreciate that D has a module system which really means a lot, coming from C++.
If I'd have to use C/C++ for some special big-ish project D might be interesting, but I think I'd usually choose other languages like Rust or V instead.