Only recently (in February 1998) women’s ice hockey was incorporated into the Olympic Winter Games, while men’s ice hockey has been a fixed event ever since the first Winter Games started in 1924.
Only recently (in February 1998) was women’s ice hockey incorporated into the Olympic Winter Games, while men’s ice hockey has been a fixed event ever since the first Winter Games started in 1924.
Only recently (in February 1998) that women’s ice hockey was incorporated into the Olympic Winter Games, while men’s ice hockey has been a fixed event ever since the first Winter Games started in 1924.
Out of these three, which one is correct? Why? And why are the others wrong?
Note: Some users have stated in comments underneath that example (3) is ungrammatical, but it's not clear why. In addition one established user said that (1) was clumsy but meant the same as (2), the difference was stylistic. Another one, however, said that (1) and (2) had different meanings. A third mentioned that negative only licensed the subject-auxiliary inversion in (2), and that it was an NPI. Whilst helpful, these do not properly explain which of (1)-(3) are acceptable and why.